Fixed tutorial level, added thumbstick support and more

This was a long overdue patch. I am trying to find time to work on 2tinycowboys and will try to keep it as 'unbroken' as possible. This should hopefully address whatever problems people would have had with the tutorial-level. Do note that once you 'win' the tutorial, however, you will need to press 'escxape' in order to return to main menu, as I have not yet implemented a high-score table for the tutorial-level.

All else should be perfectly functional now; Felipe seemed to have had some issues, which should be resolved.