Add support for brush alphas to VertexSculptTool. Replace cycle counter instrumentation with insights tags. Perf optimizations for normals computation, additional async refactoring.
MeshSculptToolBase now allows subclasses to override final commit behavior, added support for variable stamp spacing and flow rate, expose various other internal functions to subclasses. Update various brush implementations for new stamp system.
Add support for custom brush stamp Alpha function to FSculptBrushStamp
Add FMeshSculptBrushOp::::SupportsVariableSpacing(), brush stamp impls use this to indicate that they support custom Alphas. Implement support in various Sculpt brushes.
Add various functions to recompute normals for a triangle region to UE::SculptUtil
FMeshVertexChangeBuilder now supports only updating vertex color.
#rb none
#rnx
#jira none
[CL 15267008 by Ryan Schmidt in ue5-main branch]
#rb none
#rnx
#ROBOMERGE-SOURCE: CL 12908995 via CL 12908996 via CL 12909001
#ROBOMERGE-BOT: RELEASE (Release-Engine-Staging -> Main) (v682-12900288)
[CL 12909003 by ryan schmidt in Main branch]
