* Add RevealAction/UnrevealAction for revealing/hiding items in a room
* Add a lot of checks for items being revealed when it's attempted to be
triggered
* Implement TeleportAction (mostly)
* For all Check* family of actions, the `yes` and `no` values may be
just be a single action instead of an array of actions
* Change up how room descriptions and stuff work, mostly so that you can
specify multiple lines in an array so you can preserve paragraph
breaks when displayed.
* Example game has some more content
Signed-off-by: Alek Ratzloff <alekratz@gmail.com>
