Add display abstraction

In case we want to run this on something that isn't an ANSI terminal, we
have the option to implement it however we want.

Signed-off-by: Alek Ratzloff <alekratz@gmail.com>

agame/game.py

@@ -3,6 +3,7 @@ import textwrap
 from typing import Any, MutableMapping, List, Match, Optional, Sequence, Union
 from agame.action import Action
 from agame.color import colorize
+from agame.display import Display
 from agame.item import Item, ItemInst
 from agame.room import Room
 from agame.trigger import *
@@ -67,6 +68,8 @@ class Database:
 
 @dataclasses.dataclass
 class Game:
+    # Game display.
+    display: Display
     # Game room/items database
     database: Database
     # Current room.
@@ -138,13 +141,14 @@ class Game:
         "Format, colorize, wrap, and print the message."
         if lines:
             head = textwrap.fill(lines[0])
-            print(colorize(head))
+            # TODO - move colorize to Display
+            self.display.line(colorize(head))
             for line in lines[1:]:
                 message = textwrap.fill(line)
-                print()
-                print(colorize(message))
+                self.display.line()
+                self.display.line(colorize(message))
         else:
-            print()
+            self.display.line()
 
     @property
     def rooms(self):