Improved ManualMSAARenderPass: new name, no rounding errors, simplified code.

rename MSAAPass -> ManualMSAARenderPass.  Remove 32 sample pattern (leads to rounding errors), simplify the shader.

sort MSAA samples from closest to center to furthest, to use backbuffer precision for those closest.  Random order may also work.

UV Support on SubdivisionModifier

Manual MSAA pass for WebGL 1.x.  Supports 1, 2, 4, 8, 16, and 32 sample patterns.

MeshStandardMaterial: Support indirect specular occlusion

Changed exponent to penumbra in SpotLight doc

Fix "no texture bound" warnings in WebGL2 context

Added references to base material class in docu