tools: add ability to duplicate selected objects from LevelTreeView
tools: add ability to duplicate selected objects from LevelTreeView

galek/crown,mikymod/crown,mikymod/crown,dbartolini/crown,mikymod/crown,galek/crown,galek/crown,dbartolini/crown,mikymod/crown,galek/crown,dbartolini/crown,dbartolini/crown