Additional Post Processing

[reworks-org]

• shaders to do:

  • bloom
  • SSAO using luma/screen only? no depth? pseudo luma based Ambient Occlusion

• investigate if smaa is overkill and need msaa/fxaa since TAA is 3d only.

shaders:
https://github.com/crashinvaders/gdx-vfx/tree/master/gdx-vfx/effects/assets/gdxvfx/shaders
https://github.com/spite/Wagner/tree/master/fragment-shaders
add post effect support to editor