atari:xbios: merge CTPCI defines with Milan header file.
atari:xbios: Move all Milan specific stuff to specific backend file.
atari:xbios: Move all ST specific stuff to specific backend file.
atari:xbios: Keep current function for devices not migrated.
atari:xbios: Move all TT specific stuff to specific backend file.
atari:xbios: Move all Falcon specific stuff to specific backend file.
atari:xbios: Add CTPCI backend.
atari:xbios: still need to set UpdateRects after video mode set.
atari:xbios: Add missing code.
atari:xbios: Add Supervidel support, experimental.
atari:gem: Simulate key released after X ms elapsed since last key pressed.
atari:xbios: Add function to get line width.