Add support for inferring MaterialID, various methods for controlling creation of new polygroups in FOffsetMeshRegion
Add new PolyModelingFaceUtil.h/cpp with new function ComputeFaceSelectionFrame()
Add new PolyModelingMaterialUtil.h/cpp with new functions ComputeMaterialIDRange() and ComputeMaterialIDsForVertexPath()
Add Row/Column count accessor methods to FQuadGridPatch, and new function GetQuadOpeningAngle() that can return opening angle between two quad columns
Improve ComputeUVIslandForQuadPatch, now considers adjacent strips on either side to determine average target UV scale
#preflight 398f6298c5081ee9a563ceb
#rb none
[CL 23516493 by ryan schmidt in ue5-main branch]
