bunch of stuff, mostly sound improvements and code refactoring

- features listed in readme
- feature creeps add to todo
- most things rewritten entirely
- randomized sound assets, more sound assets
- autosave on exit instead of with every score change
- updated save format
- guard mode and dahud mode, changing which sound assets are used
- lots of useless unused code from trying to add achievements pop ups
(spelled wrong!)
- steamblr version of logo