Super experimental file explorer, start.
Added directory explorer.
Added file explorer to extend directory explorer.
Removed debug code in QFileSystemModelDialog -> directoryViewClicked
Objects can now be added from the new object explorer widget.
Clean up of old object browser done.
Merge remote-tracking branch 'origin/master' into Design

Conflicts:
	ToolKit/Source/MainWindow.h
	ToolKit/ToolKit.pro
Removed an old include in MainWindow.