(FRAME_DEVICE): New macro.

(FRAME_DEVICE): New macro.
(FRAME_DISPLAY, FRAME_SCREEN, FRAME_CMAP): Use FRAME_DEVICE.
(free_display_info): Use MPLIST_DO.
(free_device): Free rface->info.
(xft_close): Delete it.
(device_init): Renamed from mwin__init.
(device_fini): Renamed from mwin__fini.
(device_open): Renamed from mwin__open_device.
(x_driver): New variable.
(MXFontInfo): Delete member frame, add member display.
(Mdisplay, Mscreen, Mdrawable, Mdepth, Mwidget, Mcolormap, Mxim):
Don't declare them here.