thumbnails were really low quality, this change allows for higher quality thumbnails. one example would be 60x60 -> 120x120 still low quality but a higher low quality.

other notable changes:

• unification of all track identifiers into one
• refetch thumbnails if not existing & do not fetch thumbnail if its {id}.{png,jpeg,jpg} exist
• m3a -> m3u, it is more compatible with music players (this happened in 4c337f491dd949fdc3f1f5d51363b0342defaac1 on aug 15, i forgot to log it)

next thing to do is packaging . this is my worst nightmare so the whole program will be statically linked