GitLab

* src/image.c: Rename x_* procedures to image_* and gui_*.

* src/frame.c: Rename x_* procedures to gui_*.
* src/nsfns.c:
* src/nsterm.m: Rename x_* procedures to ns_*.

* src/w32fns.c:
* src/w32term.c: Rename x_* procedures to w32_*.

* src/termhooks.h (get_focus_frame, focus_frame_hook)
(iconify_frame_hook, set_frame_alpha_hook)
(set_new_font_hook, implicit_set_name_hook)
(change_tool_bar_height_hook, set_scroll_bar_default_width_hook)
(set_scroll_bar_default_height_hook): New terminal hooks.

* src/dispextern.h (clear_under_internal_border): New RIF function
pointer.