Add restart support

* exwm-input.el (exwm-input--exit): Cancel timers.

* exwm-manage.el (exwm-manage--manage-window): Add reparented X windows
to save-set.
* exwm-systemtray.el (exwm-systemtray--embed): Add embeded icons to
save-set.

* exwm-workspace.el (exwm-workspace--confirm-kill-emacs): No need to
unmanage; also hide Emacs frames; always call `exwm--exit'.

* exwm.el (exwm-restart): New command for restarting EXWM.
(exwm--exit-icccm-ewmh): New function for cleaning up ICCCM/EWMH
properties.
(exwm-exit-hook): Update doc string.
(exwm--exit): Call `exwm--exit-icccm-ewmh' and do not reset variables.

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