ShadowMap: Corrected number of material variants.

Fixed morphing, broken by #7236.

ShadowMap: Refactored repetitive code.

Includes more robust handling of custom materials (see #7153).

Added shadow functionality for point lights.

Updated cubeToUV() to a reduced-instruction version with minimal branching, and updated near plane values for shadow map cameras to be at least 1.

Point light shadow mapping now utilizes cube-to-2D projection, avoiding the need for a samplerCube in the shader.

Added checks for definition of POINT_LIGHT_SHADOWS in shaders for including point light shadow mapping code.

Geometry: Renamed .sortFacesByMaterial() to .sortFacesByMaterialIndex(). See 9ca9003e.

Updating SVGLoader to handle comments

Instancing reset

The documentElement will always return the svg node. Otherwise it used to fail, if there was a comment node before it. Comments are commonly seen when an svg is exported from Adobe Illustrator.

Initial commit for webgl_loader_amf.html