FDynamicMeshTriangleLabelEditBuilder

[FDynamicMeshTriangleLabelEditBuilder](API\Plugins\ModelingComponents\FDynamicMeshTriangleLabelEditBui-) builds up a [FDynamicMeshTriangleLabelEdit](API\Plugins\ModelingComponents\FDynamicMeshTriangleLabelEdit) incrementally storing old and new triangle labels