(PER_CHAR_METRIC): Remove unused macro.

(PER_CHAR_METRIC): Remove unused macro.
(fm_font_family_alist): New variable.
(syms_of_macterm): Initialize and staticpro it.
(decode_mac_font_name): Replace '-' in family name with '_' if it
occurs just once.  Lower family name.
(parse_x_font_name): Rename from x_font_name_to_mac_font_name.
All uses changed.  Remove argument MF and code conversion for it.
Add argument SIZE.  Rename argument MF_DECODED to FAMILY, and CS
to CHARSET.  Parse font size.  Lower family name.  Return integer
value for status of parsing.
(init_font_name_table) [USE_ATSUI]: Use decode_mac_font_name.
Don't use Fdowncase because family name is already lowered by
decode_mac_font_name.
(init_font_name_table): Always call decode_mac_font_name.  Add
pair of family name and its reference to fm_font_family_alist.
(mac_clear_font_name_table): Clear fm_font_family_alist.
(XLoadQueryFont): Move font size parsing part to parse_x_font_name.
Lookup fm_font_family_alist to get font family reference.
(XLoadQueryFont) [USE_ATSUI]: Don't use Fdowncase because family
name is already lowered by parse_x_font_name.