removed shader manager

Merge pull request #1992 from bchevalier/particleContainerRefactor5 ...

[Enhancement] Improved performance of adding and removing particles

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

fix a merge error from merging #1990

* Improved performance of adding and removing particles to ParticleContainer

Fix issues with multiple ParticleContainers; #1989 ...

This rebases the commits in #1989 to squash them into a single commit and
to remove the extra merge commits in @bchevalier's repo.

add batchSize param to ParticleContainer; #1990 ...

This is a rebase of the commits in #1990 to squash to a single commit and
remove the extra merge commits in @bchevalier's repo.

Improved Particle Shader performance by discarding transparent pixels

fixed extends doc issue

implement particle container destroy methods

Particle Container now respects worldAlpha ...

fixes #1655

Added blendMode to a ParticleContainer ...

also fixes alpha issue

fixed ParticleContainer update issue

fixed typos

Docs, spine and tiling sprite fixes, another deprecation warning

Docs fixes, almost got rid of the globals

massive jsdoc fixes

fix jsdoc errors

docs, more on graphics, plus particles and textures

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

linted code

ParticleContainer is ready to go..

Tidy up ...

some rogue files..

Particle Refactor part 2

style changes for if statements

Renamed SpriteBatch to.. ...

ParticleContainer! Dun dun dun!