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/actions/action.py

@@ -12,6 +12,10 @@ if TYPE_CHECKING:
 class Action:
     '''An action with no specific actor'''
 
+    def __init__(self, actor: Actor):
+        super().__init__()
+        self.actor = actor
+
     # pylint: disable=unused-argument
     def perform(self, engine: 'Engine') -> ActionResult:
         '''Perform this action.
@@ -42,17 +46,3 @@ class Action:
 
     def __repr__(self):
         return f'{self.__class__.__name__}()'
-
-
-class ActionWithActor(Action):
-    '''An action that assigned to an actor'''
-
-    def __init__(self, actor: Actor):
-        super().__init__()
-        self.actor = actor
-
-    def __str__(self) -> str:
-        return f'{self.__class__.__name__} for {self.actor!s}'
-
-    def __repr__(self):
-        return f'{self.__class__.__name__}({self.actor!r})'