Add AA Effects

[bj-rn]

• https://github.com/hjwdzh/Fluid3D/blob/master/fxaa.hlsl
• https://github.com/iryoku/smaa
• https://www.reddit.com/r/GraphicsProgramming/comments/1m4fvrt/i_created_a_custom_postprocessing_aa_shader_acrd/