Removed some header dependencies from GameplayDebugger (GameplayDebugger's pch no longer including editor headers, etc.) #UE4
[CL 2116658 by sebastian kowalczyk in Main branch]
Add explicit constructor to UStaticMeshComponent, ULandscapeComponent and FModelElement so they can be implmented in cpp file, which includes LightMap/ShadowMap.h
Rename PackedNormal.inl to PackedNormal.h and move rest of declaration, so it can be included independent of RenderUtils.h
Move FMaterialRelevance definition from PrimitiveComponent.h to MaterialInterface.h
Move FExpressionInput/FExpressionOutput/FMaterialInput etc. from MaterialShared.h into new MaterialExpressionIO.h, to avoid Material.h pulling in RHI includes
Other required includes added
#codereview rolando.caloca
[CL 2113877 by James Golding in Main branch]