Clearing and Copying Areas

• pxl-prim-cca-clear_area: clear_area/[5,6]
• pxl-prim-cca-clear_window: clear_window/1
• pxl-prim-cca-copy_area: copy_area/[8,9]
• pxl-prim-cca-copy_plane: copy_plane/[9,10]