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>

examplegame/__init__.py

@@ -13,5 +13,5 @@ from . import vars
 # Build the game state
 game = Game(
     database=database,
-    room=database.rooms["cabin_inside"],
+    room=database.rooms["prelude"],
 )