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/game.py

@@ -57,6 +57,7 @@ class Game:
             UseTrigger(),
             PutTrigger(),
             LookTrigger(),
+            ReadTrigger(),
             OpenTrigger(),
             CloseTrigger(),
             GoTrigger(),
@@ -83,24 +84,40 @@ class Game:
 
     def print_room(self):
         "Prints this room's description."
-        self.say(self.room.name)
-        self.say()
-        self.say(self.room.desc)
+        self.say(f"(({self.room.name}))")
+        if isinstance(self.room.desc, str):
+            self.say(self.room.desc)
+        else:
+            assert isinstance(
+                self.room.desc, Sequence
+            ), f"room.desc is not a list or a string from room id {room.id}"
+            self.say(*self.room.desc)
         # Look at revealed text
-        for item in self.room.items.values():
-            if not item.revealed or item.room_desc is None:
+        for (index, item) in enumerate(self.room.items.values()):
+            if not item.revealed or item.room_desc is None or item.room_desc == []:
                 continue
-            if item.room_desc == "":
-                # TODO - pluralization, 'a' vs 'an'
-                self.say(f"You see a (({item.name})).")
-            else:
-                self.say(item.room_desc)
 
-    def say(self, message: Optional[str] = None):
+            if index != 0:
+                # Space this out with blank lines
+                self.say()
+
+            if isinstance(item.room_desc, str):
+                self.say(item.room_desc)
+            else:
+                assert isinstance(item.room_desc, Sequence)
+                self.say(*item.room_desc)
+
+    def say(self, *lines: str):
         "Format, colorize, wrap, and print the message."
-        message = message or ""
-        message = textwrap.fill(message)
-        print(colorize(message))
+        if lines:
+            head = textwrap.fill(lines[0])
+            print(colorize(head))
+            for line in lines[1:]:
+                message = textwrap.fill(line)
+                print()
+                print(colorize(message))
+        else:
+            print()
 
     @property
     def rooms(self):