Creates unit-test and improves single and multiple image font loading (#4951)

Fixes Multi-Texture BitmapText Fonts (#4932)

Support for multiple textures for single bitmap font. (#4641)

Allow passing DisplayObject destroy options to PIXI.Application destroy (#4922)

Fixes handling of sprite sheet error (#4601)

Removes default loadType from the spritesheetParser load options (#4573) ...

Assuming a loadType of Resource.LOAD_TYPE.IMAGE conflicts with the ability to load an image which can't be loaded via the <image> tag.  This happens in the case of loading a compressed image which should be handled by the XmlHttpRequest file loader as an array buffer type.  In the resource loader, there is already a lookup to determine the load type: https://github.com/englercj/resource-loader/blob/master/src/Resource.js#L126
In the case of a binary image asset, the spritesheetParser's loadType stomps on a dynamic lookup based on filetype.

Standardizes how name is represented globally (#4132) ...

* Standardizes how pixi is represented as a name, adds missing meta jsdoc fields

* Replaces more missing instances

* Missing package.json description

* Fixes contributing with brand

* Cleanup the repository mentions in contributing doc

Remove duplicated base url from loader path in the bitmapFontParser (#4101)

Fixes Loader overriding destroy with removeView arg (#4018)

Application loader support (#3909) ...

* Added app.loader mixin, deprecates PIXI.loader, adds Loader.destroy

* Don't deprecate PIXI.loader

Adds namespace code examples (#3914) ...

* Adds namespace examples

* Fixes lint errors

Documentation Updates: namespaces & plugins (#3907) ...

* Better job documenting plugins and namespace

* Fixes linting errors

* Disabling hardwrap because of ESlint

* @readOnly becomes @readonly

* Fixes description, adds link, more info about excluding plugins

* Missed description

* Fixes typos

* Adds missing word

spritesheet url tests for #3715 (#3781)

support for root-relative path (#3715) (#3723)

Updated PIXI.loaders.Loader docs (#3752) ...

To match https://github.com/englercj/resource-loader actual version

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

correct blob parser import

Update to Resource loader v2; fixes #2876

Fixes logic for spritesheet resolution (#3464) ...

* Fixes logic for spritesheet resolution

* Typo

* Fixes default logic

* Added an inline comment about the resolution

resolves #2016

small tweak to keep things backwards compatible (#3297)

adds support for scale field in spritesheets

Fixes issue #2932 trimmed spritesheet (#3191)

fix #2757 by adding to cache by name & url

expose bitmap font parse, fixes #2196

fix a comment mentioned in #2016

clean up to be specific

Huge refactor to match a new shiny eslint file.

Prefer const (#3002) ...

* added prefer-const rule to .eslintrc

* eslint const autofixes

* manual let to const changes; lint free;

* added brace style 'allman' to eslintrc

* brace style, comment fixes and default arg

* brace style fixes

* more brace styles

* Point default args

* Point brace styles

* Observable Point default args

* more brace styles

* jsdoc comment style

* brace style

* brace styles and small jsdoc fix

* brace styles

* removed unneeded eslint inline comment

* brace styles; lint free

some more es6 changes (#2969) ...

* some more es6 changes
- const instead of let if possible
- arrow functions
- string templates
- argument defaults

* object property shorthand

* some more es6 changes
- const instead of let if possible
- arrow functions
- string templates
- argument defaults

* Revert "Merge branch 'dev-es6-sb' of github.com:stbaer/pixi.js into dev-es6-sb"

This reverts commit 8d3af81, reversing
changes made to e8b9948.

* Revert "Merge branch 'dev-es6' into dev-es6-sb"

This reverts commit 3eeaf79, reversing
changes made to fb69536.

* Revert "Revert "Merge branch 'dev-es6-sb' of github.com:stbaer/pixi.js into dev-es6-sb""

This reverts commit c860228.

* fix RenderTexture, incomplete merge

* fix for text font properties

* reverted some changes

* checked out License, Readme and Contributinf from dev-es6

* editorconfig updated: 2 spaces for .eslintrc

* added eslint rule: spaces around fat arrow

* used eslint fix for consistent spaces around fat arrow

* don't allow scale.x or scale.y to be 0 in displayObject setTransform

* removed jshint comments (again)