Suport manual terminal geometry specification.

	Suport manual terminal geometry specification.

	* grub-core/term/ieee1275/ofconsole.c (grub_ofconsole_dimensions):
	Save state in grub_ofconsole_terminfo_output.
	(grub_ofconsole_term): Use grub_terminfo_getwh.
	(grub_ofconsole_getwh): Removed.
	* grub-core/term/serial.c (grub_serial_getwh): Removed.
	(grub_serial_term): Use grub_terminfo_getwh.
	* grub-core/term/terminfo.c (grub_terminfo_getwh): New function.
	(options): New struct.
	(OPTION_*): New enum.
	(grub_cmd_terminfo): Transform into extcmd and handle new parameters.
	* include/grub/terminfo.h (grub_terminfo_output_state): New fields
	width and height.
	(grub_terminfo_getwh): New proto.
	* grub-core/lib/legacy_parse.c (grub_legacy_parse): Handle --lines.