Update example game some, update engine some

* 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>

agame/util.py

@@ -6,6 +6,6 @@ if TYPE_CHECKING:
 
 def search_item_name(seq: Iterable["ItemInst"], item_name: str) -> Optional["ItemInst"]:
     for item in seq:
-        if item.name == item_name or item_name in item.synonyms:
+        if item.name.lower() == item_name.lower() or item_name.lower() in item.synonyms:
             return item
     return None