Reworked graphics to make it more modular

main.py

@@ -1,9 +1,5 @@
 #!/usr/bin/env python
-from dungeonbattle.game import Game
-from dungeonbattle.term_manager import TermManager
+from dungeonbattle.bootstrap import Bootstrap
 
 if __name__ == "__main__":
-    with TermManager() as term_manager:
-        game = Game()
-        game.new_game(term_manager.screen)
-        game.run(term_manager.screen)
+    Bootstrap.run_game()