Fix various stability issues

* exwm-input.el (exwm-input--on-KeyPress-line-mode)
(exwm-input--on-KeyPress-char-mode): Append events at the tail.

* exwm-manage.el (exwm-manage--unmanage-window): Remove the
_NET_WM_DESKTOP property when an X window is withdrawn.

* exwm-systemtray.el (exwm-systemtray--init):
* exwm-workspace.el (exwm-workspace--confirm-kill-emacs):
Issue warning rather than error when there's an existing tray running.

* exwm.el (exwm--on-ClientMessage): The buffer window can be on a
floating frame.

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