Transform the copy instead of the original when shift-drag cloning
Add hotkeys to quickly rotate the selection by 90 degrees
Fix a VHE compatibility issue with the VMF format when keyvalues are more than 1024 bytes
Fix the selection of a pasted group so that all children are selected
Change the colour of groups and children when grouping and ungrouping so the colouring behaves more like VHE
Fix some online bug reports