Remove some redundancy

actions.py

@@ -1,6 +1,6 @@
 from __future__ import annotations
 
-from typing import Optional, Tuple, TYPE_CHECKING
+from typing import Optional, Tuple, TYPE_CHECKING, overload
 
 if TYPE_CHECKING:
     from engine import Engine
@@ -17,6 +17,7 @@ class Action:
         """Return the engine this action belongs to."""
         return self.entity.gamemap.engine
 
+    @overload
     def perform(self) -> None:
         """Perform this action with the objects needed to determine its scope.
 
@@ -26,7 +27,6 @@ class Action:
 
         This method must be overwritten by Action subclasses.
         """
-        raise NotImplementedError()
 
 
 class EscapeAction(Action):
@@ -51,9 +51,6 @@ class ActionWithDirection(Action):
         """Return the blocking entity at this action's destination."""
         return self.engine.game_map.get_blocking_entity_at_location(*self.dest_xy)
 
-    def perform(self) -> None:
-        raise NotImplementedError()
-
 
 class MeleeAction(ActionWithDirection):
     def perform(self) -> None:

components/ai.py

@@ -10,9 +10,6 @@ from components.base_component import BaseComponent
 
 
 class BaseAI(Action, BaseComponent):
-    def perform(self) -> None:
-        raise NotImplementedError()
-
     def get_path_to(self, dest_x: int, dest_y: int) -> List[Tuple[int, int]]:
         """Compute and return a path to the target position.
 

input_handlers.py

@@ -26,9 +26,6 @@ class EventHandler(tcod.event.EventDispatch[Action]):
             self.engine.handle_enemy_turns()
             self.engine.update_fov()
 
-    def ev_quit(self, event: tcod.event.Quit) -> Optional[Action]:
-        raise SystemExit()
-
     def ev_keydown(self, event: tcod.event.KeyDown) -> Optional[Action]:
         action: Optional[Action] = None