-Fixed Shader Graph PBR template shadows and defines to match LW
-Fixed Shader Graph Unlit template defines to match LW
-Culling in depth pre pass fixed in LW PBR
-Fixed placement of main passes instancing setup
-Added missing stereo instancing macros
-Added missing fragment Instancing ID for future work in shadow/depth passes
* Refactor GraphFunctions includes to per-pipeline
* Add Scene Color node
- And camera opaque requirements
- Returns 0s in HD
* Add Scene Depth node
* Rename GraphFunctions.hlsl > ShaderGraphFunctions.hlsl
* Update references to ShaderGraphFunctions.hlsl