feat: support Xorg & better auth logic (#80)

Co-authored-by: grialion <48643945+grialion@users.noreply.github.com>

include/signal_handler.h

@@ -0,0 +1,8 @@
+#ifndef SIGNALHANDLERH_
+#define SIGNALHANDLERH_
+
+// handle SIGTERM by sending SIGTERM to all children, resulting
+// in a graceful graphical shutdown
+void setup_sigterm();
+
+#endif /* SIGNALHANDLERH_ */