Merge branch 'master' into dev ...

# Conflicts:
#	src/core/textures/Texture.js

Fix #3790 and add unit test (#3796)

Fix #3794 (#3795) ...

Also add unit test for it and improve tests.

resolves #3783 (#3786)

Added core tests for Matrix, Ellipse, Circle and TilingSprite (#3699) ...

* Added matrix tests for prepend() and identity()

* Added contains if branch tests for Circle and Ellipse

* Removed trailing whitespace in circle.js

* Added TilingSprite tests for contains, width and height

* Removed .only tag in TilingSprite test

* Changed test values for prepand and identity tests, as per change request

Removes pending tests from Container (#3769)

[v4.4] Revert "Fix #3609 , about `filterClamp` & `filterArea` (#3626)" (#3760) ...

* Revert "Fix #3609 , about `filterClamp` & `filterArea`  (#3626)"

The real fix is to exclude "filterClamp" from uniformData
That fixes outlineFilter and glowFilter

* added a test, so finscn wont break it again ;)

[v4.4] fix SpriteRenderer for multiple webgl renderers, fix tests, add "withGL" (#3758) ...

* fix SpriteRenderer for multiple webgl renderers, fix tests, add "withGL"

* isWebGLSupported renamed to withGL

Uncomment & fix failing test from #3535. (#3638) ...

Resolves #3419 and #3628.

I just saw #3628 after I started working on this and I opened another PR (wrong) about the same bug #3628 looks good to me but adds an extra property, which I personally tend to dislike. This might have some side effects for cases that are untested, but I thought it's worth opening as an alternative to #3628.

centralise isWebGLSupported (#3740)

Fix cursors not working as expected in nested interactive objects (#3704) ...

* Changed pointerout to pointerleave.

* Add comment about pointerleave event.

* Fixed cursor changes being mishandled.

Cursor changes should not be attempted if it just just the default
value.

* Fix #3689

* Make change from #3703

* Changed pointerout to pointerleave in tests.

addChild/removeChild transform IDs were wrong (#3722) ...

* addChild/removeChild transform IDs were wrong

* better test

* uncomment expects

* also add removeChildren

* lint on tests

Fast rect blendMode problem (#3707) ...

* fast rect blendMode. Tested.

* add webgl-only test
add test for rgb2hex
fix problem in rgb2hex

InteractionManager Tests - Remove events (#3706) ...

* check for correct removal of events

* fix per test expectation

Fixes #3701 (#3702)

InteractionManager.addEvent tests (#3696) ...

* added pointer event tests

* restore setTargetElement

* use spy.restore()

* add mouse/touch events

Refactors the spritesheet, texture and bitmap font loaders (#3676) ...

* Refactors the spritesheet, texture and bitmap font loaders

* Fixes trailing space

* Addresses feedback in var caching and docs

* Adds unit test for Texture.fromLoader

* Adds new Spritesheet class

* Cleanup spritesheet destroy and imports

* Added baseTexture destroy to Spritesheet

Reworked cursor handling to expand cursor options. (#3331) ...

* Enhanced mixins, replaced cursor handling with more features.

* Cleanup and fixes to interactive classes.

Mouse over/out/move was not being handled properly, and didn't work as a
result.

* Fixed inversion of flag checking logic.

* Added tests for interaction events and cursors.

* Removed now unused variables

Variables were private and readonly, so removal should not be a problem.

* Fix #3662

Needed better tracking of if events should have default prevented.

Fixes test check for isWebGL (#3679)

Merge pull request #3666 from staff0rd/container_recalc_transform_tests ...

Added container recalc transform tests

Mask/Fill interaction tests + fix (#3615) ...

* added expectations

* specify hitArea

* change expectation

* added filterArea expectation

* heed hitArea when mask present

* typo

* removed filterArea from interaction

Added recursive children hitTest tests (#3665) ...

* added recursive children hitTest tests

* remove superfluous parameter

lint

trigger initial transform calc

Merge remote-tracking branch 'upstream/dev' into container_recalc_transform_tests

Added legacy option to webGL renderer (#3630) ...

* Added legacy option to webGL renderer

Setting ```legacy``` to true now forces VertexArrayObjects and
MultiTexture Batching to be disabled. We also store the variable on the
renderer just incase we want to use it to force settings in anything
else.

also added a test

* remove WebGLTests as they don't work on server

* Added extra param to Application

* Adds WebGL test for legacy

* Better check for WebGL in tests

added Graphics.containsPoint with no fill expectation (#3608)

added container recalc transform tests

Rebasing on dev to get MockPointer changes for #3375 (#3546) ...

* Fix issue #2662 Added a touch counter instead of flag to ensure the correct touch count

* See #2662 --- bending to the will of eslint

* See #2662 --- Added _touchCount to interactiveTarget.js, and removed an extraneous line in InteractionManager.js

* Removed an unnecessary check for _touchCount === undefined, since the mixin for interactiveTarget will always set this

* Fix issue #2662 Added a touch counter instead of flag to ensure the correct touch count

* See #2662 --- bending to the will of eslint

* See #2662 --- Added _touchCount to interactiveTarget.js, and removed an extraneous line in InteractionManager.js

* Removed an unnecessary check for _touchCount === undefined, since the mixin for interactiveTarget will always set this

* Adding cancel events to interaction manager

* Refactoring InteractionManager to normalize all events to PointerEvents. Also updated InteractiveTarget to handle multiple touch or pointer events by recording pointerId for all tracked events, rather than just counting events. Finally, InteractionManager now updates on all tracked events, rather than just mouse events, so it should send move events when UI objects move underneath any held event, not just the mouse

* Typo: mouse is not a function

* InteractionManager normalizeToPointerData now returns an array of normalized events for TouchEvents with multiple changedtouches

* Typo: no such thing as onPointerStart

* Fixing some more typos: trying to read the pointerId of un-normalized events

* Typos: un-normalized events don't have a pointerType

* Added identifier property to InteractionData, and got rid of some typos---trying to read pointerId from un-normalized events

* Forgot to bind onPointerCancel

* Refactoring interactiveTarget.js a bit, so that over, left down and right down are pointer properties, not mouse properties.

* Forgot an export default

* Changed the mixin pattern for Pixi.interaction.interactiveTarget, so that this is bound correctly, so that DisplayObjects can each get a unique object for tracking pointers

* Fixed some typos, moved interactiveTarget back to being an object, and released InteractionData after touch up/cancelled events

* Small fixed

* Safari compatibility

* hasOwnProperty fix

* Safer to use a string for mouse pointer than a number

* InteractionManager should now handle native DOM pointer events with pointerType mouse or touch by emitting mouse and touch events, respectively

* InteractionManager test now respects the refactored spec for InteractionManager

* Pointer events exclusive

* String.startsWith is not available in all browsers esp. older version of Safari. As it's just used in one place we can use a RegExp here too

* Moving from regex, slightly faster

* See #3149 --- Add support for touchcancel and pointercancel (#3375)

* Fix issue #2662 Added a touch counter instead of flag to ensure the correct touch count

* See #2662 --- bending to the will of eslint

* See #2662 --- Added _touchCount to interactiveTarget.js, and removed an extraneous line in InteractionManager.js

* Removed an unnecessary check for _touchCount === undefined, since the mixin for interactiveTarget will always set this

* Fix issue #2662 Added a touch counter instead of flag to ensure the correct touch count

* See #2662 --- bending to the will of eslint

* See #2662 --- Added _touchCount to interactiveTarget.js, and removed an extraneous line in InteractionManager.js

* Removed an unnecessary check for _touchCount === undefined, since the mixin for interactiveTarget will always set this

* Adding cancel events to interaction manager

* Refactoring InteractionManager to normalize all events to PointerEvents. Also updated InteractiveTarget to handle multiple touch or pointer events by recording pointerId for all tracked events, rather than just counting events. Finally, InteractionManager now updates on all tracked events, rather than just mouse events, so it should send move events when UI objects move underneath any held event, not just the mouse

* Typo: mouse is not a function

* InteractionManager normalizeToPointerData now returns an array of normalized events for TouchEvents with multiple changedtouches

* Typo: no such thing as onPointerStart

* Fixing some more typos: trying to read the pointerId of un-normalized events

* Typos: un-normalized events don't have a pointerType

* Added identifier property to InteractionData, and got rid of some typos---trying to read pointerId from un-normalized events

* Forgot to bind onPointerCancel

* Refactoring interactiveTarget.js a bit, so that over, left down and right down are pointer properties, not mouse properties.

* Forgot an export default

* Changed the mixin pattern for Pixi.interaction.interactiveTarget, so that this is bound correctly, so that DisplayObjects can each get a unique object for tracking pointers

* Fixed some typos, moved interactiveTarget back to being an object, and released InteractionData after touch up/cancelled events

* Small fixed

* Safari compatibility

* hasOwnProperty fix

* Safer to use a string for mouse pointer than a number

* InteractionManager should now handle native DOM pointer events with pointerType mouse or touch by emitting mouse and touch events, respectively

* InteractionManager test now respects the refactored spec for InteractionManager

* Pointer events exclusive

* String.startsWith is not available in all browsers esp. older version of Safari. As it's just used in one place we can use a RegExp here too

* Moving from regex, slightly faster

* Fixed interaction tests for the new world of pointer events

fix unexpected 0 text behaviour (#3650) ...

We got a weird glitch upgrading from pixi 3 to 4, setting the text in a PIXI.Text to 0 results in the label actually saying ' '. This seems like unexpected behaviour considering all the other numbers work :)