Improve toggling fullscreen state of frames.

Improve toggling fullscreen state of frames.

* frame.el (toggle-frame-maximized, toggle-frame-fullscreen):
Rename frame parameter `maximized' to `fullscreen-restore'.
Restore fullwidth/-height after fullboth state.  Update
doc-strings.
* w32term.c (w32_read_socket): In SIZE_MAXIMIZED and
SIZE_RESTORED cases correctly handle `maximized' value for the
`fullscreen' parameter.  Don't use the 'maximized' parameter any
more.
(w32fullscreen_hook): Include menu bar height when calculating
new text height in FULLSCREEN_BOTH case.
* xterm.c (do_ewmh_fullscreen): Handle transition from
FULLSCREEN_BOTH to FULLSCREEN_MAXIMIZED when
x_frame_normalize_before_maximize is set.
* frames.texi (Size Parameters): Update description of
fullscreen frame parameter.