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/action.py

@@ -11,8 +11,9 @@ __all__ = (
     "Action",
     "SleepAction",
     "PrintAction",
-    "TeleportAction",
     "PrintRoomAction",
+    "PlayerInputAction",
+    "TeleportAction",
     "GetAction",
     "CheckInvItemsAction",
     "CheckRoomItemsAction",
@@ -73,6 +74,35 @@ class PrintAction(Action):
             game.say(line)
 
 
+@dataclasses.dataclass
+class PrintRoomAction(Action):
+    """
+    Prints the current room.
+    """
+
+    def act(self, game: "Game"):
+        game.say("", "." * 70, "")
+        game.print_room()
+
+
+@dataclasses.dataclass
+class PlayerInputAction(Action):
+    """
+    Waits for a user to press a key, or press enter, or whatever.
+    """
+
+    prompt: str = "Press enter to continue..."
+    store_var_id: Optional[str] = None
+
+    def act(self, game: "Game"):
+        line = input(self.prompt)
+        if self.store_var_id:
+            assert (
+                self.store_var_id in game.vars
+            ), f"could not find var with id {self.store_var_id}"
+            game.vars[self.store_var_id] = line
+
+
 @dataclasses.dataclass
 class TeleportAction(Action):
     """
@@ -90,22 +120,12 @@ class TeleportAction(Action):
         assert (
             self.room_id in game.database.rooms
         ), f"could not find room with id {self.room_id}"
-        game.room = game.database.rooms[self.room_id]
+        game.teleport(game.database.rooms[self.room_id])
         if self.announce:
             game.say("", "." * 70, "")
             game.print_room()
 
 
-class PrintRoomAction(Action):
-    """
-    Prints the current room.
-    """
-
-    def act(self, game: "Game"):
-        game.say("", "." * 70, "")
-        game.print_room()
-
-
 @dataclasses.dataclass
 class GetAction(Action):
     """