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/room.py

@@ -3,6 +3,9 @@ from typing import MutableMapping, Optional, Sequence, Union, TYPE_CHECKING
 from agame.item import ItemInst
 from agame.util import search_item_name
 
+if TYPE_CHECKING:
+    from agame.action import Action
+
 
 __all__ = ("Room",)
 
@@ -13,6 +16,8 @@ class Room:
     name: str
     desc: Union[str, Sequence[str]]
     items: MutableMapping[str, ItemInst]
+    # Actions that are executed upon teleport or entrance to this room.
+    teleport_actions: Sequence["Action"]
 
     def __init__(
         self,
@@ -20,6 +25,7 @@ class Room:
         name: str,
         desc: Union[str, Sequence[str]],
         items: Union[Sequence[ItemInst], MutableMapping[str, ItemInst]],
+        teleport_actions: Sequence["Action"] = [],
     ):
         self.id = id
         self.name = name
@@ -28,6 +34,7 @@ class Room:
             self.items = items
         else:
             self.items = {item.id: item for item in items}
+        self.teleport_actions = teleport_actions
 
     def search_item_name(self, item_name: str) -> Optional[ItemInst]:
         """