Clipboard, Cursor and MessageBox
	new file:   .pymake
	new file:   StiGame/Clipboard.cpp
	new file:   StiGame/Clipboard.h
	new file:   StiGame/Cursor.cpp
	new file:   StiGame/Cursor.h
	new file:   StiGame/MessageBox.cpp
	new file:   StiGame/MessageBox.h
	modified:   StiGame/StiGame.cbp
	modified:   StiGame/Viewport.cpp
	modified:   StiGame/Viewport.h
	modified:   retrieve_extern.py
little changes
	modified:   retrieve_extern.py