Features:
+* socket units: allow creating a udev monitor socket with ListenDevices= or so,
+ with matches, then actviate app thorugh that passing socket oveer
+
* coredump: maybe when coredumping read a new xattr from /proc/$PID/exe that
may be used to mark a whole binary as non-coredumpable. Would fix:
https://bugs.freedesktop.org/show_bug.cgi?id=69447