Set Xft defaults if no XSETTING is found, better default for Gtk+ font dialog.

Set Xft defaults if no XSETTING is found, better default for Gtk+ font dialog.

* xfns.c (Fx_select_font): Try to convert Fontconfig name to Gtk name
because that is what Gtk+ font dialog understands.

* font.c (font_make_object, Fcopy_font_spec): Use Fcopy_alist instead
of Fcopy_sequence.
(font_open_by_name): Put name given into QCname for font-object returned.

* frame.c (x_set_font): Save original font name as frame parameter
font-parameter.

* xsettings.c (set_default_xft_settings): New function.
(init_xfd_settings): Call set_default_xft_settings if no XSETTINGS window
is found.