/tmp is now only hardcoded in the singular unit test

errors are more friendly, m3a generation has been refitted to be m3u generation so that more music players are supported, fixed a bug where songs would be downloaded with audio/{id}..m4a which is an invalid path, and updated the user agent to be a firefox extended support release so i dont have to update it more

downloads were broken by the rustypipe switch, so i fixed them by forcing the AndroidVr client. some tracks are weird and still don’t work, but most do