some tweaks

moved particle renderer outside of core

fixed up particle container fro v4

removed forced canvas

refactored canvas ...

cacheAsBitmap
renderTexture

Fixed Canvas Renderer ...

Masks
RenderTextures

removed unfinished parts ...

removed old shader code

adde drew blend mode function

tweaks filters again sprite mask now works

filter progress

tweak render texture

streamlined the webGL renderer a bit

Changes for pixi-compressed-textures ...

1) newer version of resource-loader
2) pass the metadata to images
3) export WebGLManager

Since I'm in there, fix the all the links too

Depecrate `PIXI.math` namespace ...

Access math members from PIXI when outside of core, require the math module directly when inside of core.

fix typos

Remove internal filter aliases on PIXI.filters, expose on PIXI instead as PIXI.AbstractFilter ...

These are undocumented and unecessarily create a tight coupling between core and filters where the filters package is actually responsible for exposing an internal core module.

moved ticker to core

expose ObjectRenderer and RenderTarget

expose TextureUvs on core, and use that from TilingSprite

add math back as a namespaced export as well as on core

fix missing doc for autoDetectRenderer

Move items into their namespace ...

This commit also:

 - fixes some dangling whitespace,
 - fixes some incorrect docs in extras/mesh,
 - moves Text to core
 - moves BitmapText to extras
 - moves math constants to const.js

use core.utils ref

extend -> object-assign

mess with exports a bit

Moved the deprecation warnings to their own file, thanks @drkibitz for the suggestion

Docs, spine and tiling sprite fixes, another deprecation warning

Added deprecation warnings

Docs, mostly the display and graphics folders and some filetype update