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This makes icon-sender handle GUI restart, same as qubes-gui and
audio. However, in this case we are not running raw vchan, but
Qubes RPC, so the procedure is more complicated: we start a
qrexec-client-vm subprocess, and restart it if it breaks.
Needs icon-receiver to be a service with wait-for-session
(QubesOS/qubes-gui-daemon#37), and fix for socket services in dom0
(QubesOS/qubes-core-qrexec#42).