- create a new MeshTopologySelector base class. The existing GroupTopologySelector class now inherits from it, as does a new BoundarySelector class
- likewise, create a new MeshTopologySelectionMehchanic base class and have (existing) PolygonSelectionMechanic and (new) BoundarySelectionMechanic inherit from it
- the new Boundary classes use FMeshBoundary loops to define selectable loops rather than FGroupTopology
HoleFillTool:
- change to using BoundarySelectionMechanic instead of GroupTopologySelector
Misc:
- allow FMeshBoundaryLoops to fail untangling a loop with bowties but still continue processing other loops
#jira UE-144821
#rb jimmy.andrews
#preflight 63222176e93a80888cb7d3df
[CL 22013854 by tyson brochu in ue5-main branch]
