- Support brushes in the "Add+" menu by removing the CustomGenerator using SBspPalette which wasn't needed anymore and adding DragHandler support in FPlacementMenuEntry
- Added support for short category names to fit buttons. Section headers still use the full names.
- Removed mention of dragging from the empty favorites hint text
- Removed unused bInUseLongDisplayName from FBuilderInput
#jira UE-205201
[CL 34542153 by jeanmichel dignard in ue5-main branch]