(Qarrow, Qhand, Qtext, Qpointer): New variables for

(Qarrow, Qhand, Qtext, Qpointer): New variables for
pointer types.
(Qrelative_width, Qalign_to): Remove unused variables.
(Vvoid_text_area_pointer): Replace Vshow_text_cursor_in_void.
(QCmap, QCpointer, Qrect, Qcircle, Qpoly): New variables for
image maps.
(x_y_to_hpos_vpos): Return glyph relative coordinates through
new dx and dy args.
Remove buffer_only_p arg (always 0).  Simplify code accordingly.
(get_glyph_string_clip_rect): Draw cursor using glyph's rather
than row's ascent and height, to get sensible height on tall rows.
(build_desired_tool_bar_string): Remove Qimage extern.
(get_tool_bar_item): Fix call to x_y_to_hpos_vpos.
(produce_image_glyph): Adjust it.ascent to minimum row ascent if
image glyph is alone on the last line.
(append_glyph, append_composite_glyph, produce_image_glyph)
(append_stretch_glyph): Set glyph's ascent and descent.
(on_hot_spot_p): New function to check if position is inside an
rectangular, circular, or polygon-shaped image hot-spot,
(find_hot_spot): New function to search for image hot-spot.
(Flookup_image_map): New defun to search for image hot-spot.
(define_frame_cursor1): New aux function to determine frame pointer.
(note_mode_line_or_margin_highlight, note_mouse_highlight):
Handle `pointer' text property and :pointer image property to
control frame pointer shape.  Detect image hot-spots for pointer
and help_echo properties.  Use define_frame_cursor1.
(note_mouse_highlight):	Use Vvoid_text_area_pointer.
(syms_of_xdisp): Defsubr new defun. Intern and staticpro new variables.
DEFVAR_LISP Vvoid_text_area_pointer instead of Vshow_text_cursor_in_void.