Add room entry auto-triggers, player input, and more

* When you teleport to a room, the teleport auto-triggers fire.
* Rooms have auto-triggers. None by default. They are run every time you
  teleport to a room, and when the game starts. Gate behavior behind a
  variable.
* PlayerInputAction waits for player input (and potentially write it
  into a variable)

Signed-off-by: Alek Ratzloff <alekratz@gmail.com>

agame/game.py

@@ -1,6 +1,6 @@
 import dataclasses
 import textwrap
-from typing import Any, MutableMapping, List, Match, Optional, Sequence
+from typing import Any, MutableMapping, List, Match, Optional, Sequence, Union
 from agame.action import Action
 from agame.color import colorize
 from agame.item import Item, ItemInst
@@ -98,6 +98,17 @@ class Game:
         for action in actions:
             action.act(self)
 
+    def do_teleport_actions(self):
+        "Executes the teleport actions for the current room."
+        self.do_actions(self.room.teleport_actions)
+
+    def teleport(self, room: Union[str, Room]):
+        if isinstance(room, str):
+            assert room in self.database.rooms, f"could not find room with id {room}"
+            room = self.database.rooms[room]
+        self.room = room
+        self.do_teleport_actions()
+
     def print_room(self):
         "Prints this room's description."
         self.say(f"(({self.room.name}))")