Capture SIGINT Ctrl+C for a clean server exit through atexit

engine/start.py

@@ -229,6 +229,13 @@ except:
     pass
 
 
+#Capture Ctlr+C / SIGINT and let @atexit handle the rest.
+import signal
+import sys
+def signal_handler(sig, frame):
+    sys.exit(0) #atexit will trigger
+signal.signal(signal.SIGINT, signal_handler)
+
 #Catch Exceptions even if PyQt crashes.
 import sys
 sys._excepthook = sys.excepthook