(struct x_output): Move members left_pos, top_pos,

(struct x_output): Move members left_pos, top_pos,
border_width, pixel_height, pixel_width, line_height,
internal_border_width, vertical_scroll_bar_extra,
left_fringe_width, right_fringe_width, fringe_cols,
fringes_extra, win_gravity, size_hint_flags, want_fullscreen,
x_pixels_diff, and y_pixels_diff to struct frame (frame.h).
(FRAME_INTERNAL_BORDER_WIDTH, FRAME_LINE_HEIGHT): Move to frame.h.
(FRAME_DEFAULT_FONT_WIDTH): Remove macro.
(PIXEL_WIDTH, PIXEL_HEIGHT)
(FRAME_X_FRINGE_COLS, FRAME_X_FRINGE_WIDTH)
(FRAME_X_LEFT_FRINGE_WIDTH, FRAME_X_RIGHT_FRINGE_WIDTH): Moved to
frame.h and renamed [see frame.h changes].
(CHAR_TO_PIXEL_ROW, CHAR_TO_PIXEL_COL, CHAR_TO_PIXEL_WIDTH)
(CHAR_TO_PIXEL_HEIGHT, PIXEL_TO_CHAR_ROW, PIXEL_TO_CHAR_COL)
(PIXEL_TO_CHAR_WIDTH, PIXEL_TO_CHAR_HEIGHT): Moved to frame.h
and renamed [see frame.h changes].