Delete render buffer on destroy

Ensure that Quad.destroy gets called.

Add destroy function to Quad

fixed typo in webgl renderer. updated renderTexture example

Cleanup primitive and complex shader during ShaderManager destroy ...

Not doing this causes more shaders to be created then destroyed.

Merge pull request #2042 from stbaer/gr-fixes ...

some jsdoc fixes; bit of cleanup

WebGLRenderer: clean up texture event listeners ...

On destruction remove event listeners from all BaseTextures in the
cache. Closes pixijs/pixi.js#1968.

fix some doc issues; fixes #2066

Merge pull request #2045 from LibertyGlobal/cleanup_fixes ...

Add calls to super destructors and other extra cleanup work.

Revert unneccessary changes from our code base

Add calls to super destructors and other extra cleanup work.

some jsdoc fixes; bit of cleanup

Massive documentation update; fixes many issues. ...

Issues fixed by these documentation updates:

- #1973, fixed filter and BitmapText property docs
- #1908, fixed type reference links
- #1856, fixed name of MeshShader

add missing drawCount increments

uuid is a misnomer, this is not universal, but it is unique in the scope of pixi ...

Added deprecation for uuid

add bool uniform support in the shader

Expose drawModes like blendModes ...

This separates the pixi contant value from the GL constant value. Even
though right now they *should* be the same, if there are platform
differences, or changes in the future ours will always work this way.

properly initialize projectionMatrix; fixes #1811

minor jshint fixes

properly handle context restore; fixes #1788

fixed extends doc issue

fix webgl manager destroy to remove correct event handler

remove some private docs

fixed initial filter texture upload bug

fix #1727 move viewport resize

resize gl viewport in webgl; fixes #1712

reset drawCount each render call; fixes #1661

fixed a bug i introduced ...

because I’m a donut..

Fixed filter area clone bug

fixed filter issue