* nsfns.m (x_set_foreground_color, x_set_background_color)

* nsfns.m (x_set_foreground_color, x_set_background_color)
(x_set_cursor_color, x_set_icon_name, x_explicitly_set_name)
(x_set_title, x_set_icon_type, x_set_cursor_type): Rename to use
x_ prefix instead of ns_.  Update references.
(syms_of_nsfns): Add a FIXME comment.

* nsterm.m (x_set_cursor_type): New prototype.
(setValuesFromPanel): Use it instead of the old ns_ prefixed name.