void ufoEditorDraw( ufoEditor editor_instance);
ufoEditorDraw causes the editor to set up the context for OpenGL drawing and call ufoEditorOverlayDraw or ufoEditorRGB Draw if supplied.
If you need to call ufoEditorDraw from within event functions in the user-defined GUI, then the UFO will need to store the ufoEditor pointer passed to it in ufoEditorCreateGui when this editor instance was created.
ufoEditorDraw may be called within ufoEditorMouseDown, ufoEditorMouseUp, ufoEditorMouseDrag, ufoEditorMousePosition, ufoEditorKeyEvent, or from within any event function in the editor GUI.
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