Handle SIGINT, SIGTERM, SIGUP and SIGQUIT

src/backend/qml_bridge.py

@@ -14,9 +14,9 @@ class.
 """
 
 import asyncio
+import atexit
 import logging as log
 import os
-import pyotherside
 import signal
 import traceback
 from concurrent.futures import Future
@@ -24,6 +24,8 @@ from operator import attrgetter
 from threading import Thread
 from typing import Coroutine, Sequence
 
+import pyotherside
+
 from .pyotherside_events import CoroutineDone, LoopException