Add connection_quality setting (hidden for now)

settings.py

@@ -19,6 +19,7 @@ class SettingsFile(TypedDict):
     priority: list[str]
     priority_only: bool
     autostart_tray: bool
+    connection_quality: int
     tray_notifications: bool
 
 
@@ -29,6 +30,7 @@ default_settings: SettingsFile = {
     "autostart": False,
     "priority_only": True,
     "autostart_tray": False,
+    "connection_quality": 1,
     "language": DEFAULT_LANG,
     "tray_notifications": True,
 }
@@ -51,6 +53,7 @@ class Settings:
     priority: list[str]
     priority_only: bool
     autostart_tray: bool
+    connection_quality: int
     tray_notifications: bool
 
     PASSTHROUGH = ("_settings", "_args", "_altered")