UV packing issue for geometries with high chart count
#jira UE-69450
#jira UE-56602
#jira UE-56555
#jira UEENT-322
#rb JeanMichel.Dignard
#ROBOMERGE-SOURCE: CL 4923742 in //UE4/Release-4.22/...
#ROBOMERGE-BOT: RELEASE (Release-4.22 -> Main)
[CL 4923746 by johan duparc in Main branch]
Add a generic opaque mesh view interface FLayoutUV::IMeshView to abstract mesh data access and allow FLayoutUV to be used with any mesh type in any module.
Replaced few instances of using an old version of overlapping corners data structure (multi-map) with new specialized FOverlappingCorners container.
#rb Alexis.Matte
#rb Brian.Karis
[CL 4242975 by Yuriy ODonnell in Dev-Editor branch]