Fixed crash when undoing a reparenting operation.

The undo operation did not determine the correct set of parent entities which need to be notified about the changes. In some cases, some entities were notified twice, leading to a crash.
Update input state and hits before showing the popup menu.
Show angle indicators for selected entities.
Removed some log messages.
Fixed a problem when renaming entity keys.
Don't deactivate drag and drop tools.
All keyboard shortcut defaults must use the Ctrl key.
Properly update the selection bounds.
Fixed entity rotation.
Don't overdraw text in 3D view.