SuperTux Advance - Beta web version port

Controls: Move: arrow keysJump: ZShoot: XRun: left shiftItem swap: APause: Esc A port of SuperTux Advance so that it can run in a web browser! Note that Im not the author of SuperTux Advance I simply ported the codebase to javascript and a browser environment. SuperTux Advance: https://github.com/KelvinShadewing/supertux-advance Web version port: https://github.com/dtsudo/WorkInProgress-SuperTux-Advance-Web-Version-Port