Improve X event timestamp tracking

Fix two problems with our handling of X timestamps

1) We're not properly updating the X interaction timestamp after
receiving certain input events, and

2) X events sent in response to emacsclient commands get stale
timestamps because the timestamp tracking doesn't take into account
that interactions with the user can occur outside the X input
event channel.

* src/xterm.c:
(x_display_set_last_user_time_1): New function.
(x_display_set_last_user_time): Call it.
(x_ewmh_activate_frame): Refactor.
(x_focus_frame): Don't call XSetInputFocus if we can use EWMH activation.
(server_timestamp_predicate): New function.
(x_get_server_time): New function.
(x_note_oob_interaction): New function.
(x_create_terminal): Register new function as terminal hook.

* src/termhooks.h: New hook: note_oob_interaction_hook.

* src/gtkutil.h:
(xg_set_user_timestamp): Declare.

* src/gtkutil.c:
(xg_set_user_timestamp): New function.

* src/frame.c:
(Fframe_note_oob_interaction): New function.
(syms_of_frame): Register it.

* lisp/server.el:
(server-switch-buffer): Call frame-note-oob-interaction when user
requests frame be raised.

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