Provide interface to suspend screensaver

[Former user]

I'd like a simple method to suspend the screensaver when an application does not provide that funcitonality internally. E.g. something like SIGUSR1 -> xcb_screensaver_suspend(TRUE) SIGUSR2 -> xcb_screensaver_suspend(FALSE) SIGALRM -> update a file with the current status (e.g. $XDG_RUNTIME_DIR/$DISPLAY.ss.state)