SL-19808: Fix orientation of PBR normal texture when texture transform and/or texture animation is applied

SL-19265: Fix precision issue with texture transforms by moving transform matrix calculation into the shader

SL-19228: Fix GLTF texture transform rotation and add UV debug (PBR only). See textureUtilV.glsl for UV coordinate comments

SL-18485: Render GLTF materials with extension KHR_texture_transform with approprate texture transforms

SL-18095 WIP -- Add Mikktspace tangent generation for PBR materials and switch to per-pixel binormal generation.  Still bugged with some test content.

SH-1682 Dynamically adjust the number of texture channels to use for indexed texture rendering based on available hardware.

See https://wiki.lindenlab.com/wiki/License_Substitution for details.

Self reviewed.

Merge of QAR-1267 to trunk.  This was a combo merge of QAR-1175 (maint-render-9) and QAR-1236 (dll-msvcrt-2)

svn merge -r 109838:112264 svn+ssh://svn.lindenlab.com/svn/linden/branches/maint-render/maint-render-9-merge-r109833

QAR-389