Implement surrogate menu bars for tty child frames

* lisp/menu-bar.el (popup-menu): When asked to pop up MENU from
a tty child frame try to use menu of its root frame.
(menu-bar-open): When FRAME is a child frame and
'tty-menu-open-use-tmm' is nil, navigate menu bar of its root
frame.
* src/keymap.c (Fcurrent_active_maps): Accept live window as
POSITION argument and use its buffer as current when processing
the key sequence.  Needed for tty child frames so the root
frame's menu bar can be updated according to the selected
window's buffer when navigating the menu bar from keyboard.
* src/xdisp.c (prepare_menu_bars): If the selected window's
frame is a tty child frame without menu bar, that frame's root
frame has a menu bar and 'tty-menu-open-use-tmm' is nil, prepare
to update the menu bar of the root frame as surrogate.
(update_menu_bar): New argument W denoting the window that
should be considered as selected.  For a tty child frame using F
as surrogate menu bar frame this specifies the child frame's
selected window and its buffer shall be used for updating the
menu bar of the root frame instead of the buffer of the root
frame's selected window.
(redisplay_window): Instead of setting redisplay_menu_p flag
always call display_menu_bar right away.  This facilitates to
call display_menu_bar for a tty child frame with its root
frame as surrogate menu bar frame.
(display_tty_menu_item): If the selected frame is a tty child
frame, overwrite its root frame's glyph matrix (and not that of
the child frame) when displaying a menu item.
(Qtty_menu_open_use_tmm): Define symbol.

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