Remove QuitAction and ActionWithActor!

Move quit event handling to the interface and flatten the Action class
hierarchy. There are no longer any actions that don't take an Actor. This has
the happy side effect of resolving some pylint errors too. :)

erynrl/interface/events.py

@@ -2,7 +2,7 @@
 
 '''Defines event handling mechanisms.'''
 
-from typing import TYPE_CHECKING
+from typing import NoReturn, TYPE_CHECKING
 
 from tcod import event as tev
 
@@ -42,6 +42,11 @@ class InterfaceEventHandler(tev.EventDispatch[bool]):
     def ev_mousebuttonup(self, event: tev.MouseButtonUp) -> bool:
         return self._handle_event(event)
 
+    def ev_quit(self, event: tev.Quit) -> NoReturn:
+        # TODO: Maybe show a "do you want to quit?" alert?
+        # TODO: Probably inform the engine that we're shutting down.
+        raise SystemExit()
+
     def _handle_event(self, event: tev.Event) -> bool:
         for handler in self._handlers:
             if handler and handler.dispatch(event):