Make (many) trivial substitutions for renamed and

Make (many) trivial substitutions for renamed and
new macros in dispextern.h, frame.h and window.h.
(window_box_width): Adapt to per-window fringes and scroll bars,
and new fringe vs. display margin position. Note that returned
value is no longer guaranteed to be a whole multiple of the frame
column width, since per-window fringes may now be any width.
(window_box_left_offset): New function like window_box_left, but
value is relative to left border of window (rather than frame).
(window_box_right_offset): New function like window_box_right,
but value is relative to left border of window.
(window_box_left): Adapt to per-window fringes and scroll bars,
and new fringe vs. display margin position.  Simplify by using
WINDOW_LEFT_EDGE_X and window_box_left_offset.
(window_box): Allow null args for unnecessary return values;
change/simplify relevant callers.
(x_y_to_hpos_vpos): Adapt to per-window fringes and scroll bars,
and new fringe vs. display margin position.  Use
window_box_left_offset and window_box_right_offset
(get_glyph_string_clip_rect): Adapt to per-window fringes and
scroll bars, and new fringe vs. display margin position.  Use
WINDOW_LEFT_EDGE_X and WINDOW_TOTAL_WIDTH.
(draw_fringe_bitmap): Rework to handle per-window fringes and new
fringe vs. display margin position.
(hscroll_window_tree): Use window_box_width instead of window_box.
(redisplay_window):  Adapt to per-window scroll bars.
(draw_glyphs):  Rework to handle per-window fringes and scroll
bars, and new fringe vs. display margin position.  Use
WINDOW_LEFT_EDGE_X, WINDOW_TOTAL_WIDTH, and window_box_left.
(x_clear_end_of_line):  Adapt to per-window fringes and scroll
bars, and new fringe vs. display margin position.  Fix bug which
increased total width of full_width rows by width of scroll bars
although window's total width already includes that.
(x_fix_overlapping_area): Simplify using window_box_left_offset.
(expose_area): Simplify using window_box_left_offset.
(x_draw_vertical_border): Handle per-window scroll bar settings,
mixing windows with left, right and no scroll bars.