Remove MultiLineText as gosu natively supports newlines, Update Text to correctly calculate its height, call super in button_down/button_up to support gosu's fullscreen toggle, added Window.text_input = nil to GameState to prevent fustrating bugs that stem from forgetting to set it back to nil.

lib/cyberarm_engine/game_state.rb

@@ -9,6 +9,7 @@ module CyberarmEngine
       @options = options
       @game_objects = []
       @global_pause = false
+      $window.text_input = nil unless options[:preserve_text_input]
 
       @down_keys = {}