libroar/RoarCanvasCommands{,Edit,File,Help,Tools}.py: split from libroar/RoarCanvasInterface.py. libroar/RoarCanvasWindow.py: updated. libroar/RoarClient.py: updated. libroar/RoarWindowAbout.py: renamed from libroar/RoarClientAboutWindow.py. roar.py: updated.
libroar/RoarClientAboutWindow.py: merged from libgui/GuiCanvasInterfaceAbout.py. libgui/GuiFrame.py:Gui{Command{,List},Select}Decorator(): moved from libroar/RoarCanvasInterface.py. libroar/RoarClient.py: updated.
libroar/RoarCanvasWindow.py, libgui/GuiWindow.py: split from libgui/GuiCanvasPanel.py. roar.py: updated.