GeometrySelection.h/cpp: FGeometrySelection, FGeometrySelectionEditor, representation and manipulation of a generic element-level selection, stored as a set of uint64. Editor makes changes to Selection while tracking deltas.
GeometrySelectionUtil.h/cpp: utility and helper functions for editing/processing a mesh+selection
GeometrySelector.h: FGeometryIdentifier type used to identify target objects with element-level selection support. IGeometrySelector interface that defines API for element selection for a type of target object. Factory type for spawing instances. IGeometrySelectionTransformer interface that defines API for element-level transformation
GeometrySelectionManager.h/cpp: UGeometrySelectionManager that maintains set of 'active targets' with associated Selector, Selection, and SelectionEditor, and provides high-level API for creating and querying element selections, 3D transforms of selections, selection undo/redo, and (currently) limited debug rendering
GeometrySelectionChanges.h/cpp: FChange types for element selection changes
DynamicMeshSelector.h/cpp: implementation of IGeometrySelector for UDynamicMesh/Component
#rb jimmy.andrews
#preflight 62bdb9cbb024a2608c38b72d
[CL 20896967 by Ryan Schmidt in ue5-main branch]