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/trigger.py

@@ -84,6 +84,7 @@ class HelpTrigger(Trigger):
         game.say()
         for trigger in game.database.triggers:
             game.say(trigger.help())
+        game.say("To quit the game, type ((quit)).")
 
 
 class GetTrigger(Trigger):