Open Surge: retro game engine

* Auto-detect gamepad layouts for consistent cross-platform behavior * Introduced a more sophisticated architecture for the Audio System * Prevent the underwater muffler from altering the drowning music * Changed the formula of the underwater muffler * Pause or resume all audio when pausing or resuming the game * Improved the Pipe System and made it re-entrant * Improved the Title Card script * Prevent collected Life Powerups from respawning when restarting the level * Surge the Rabbit: introduc