fix invalid labels markup for tracks table
never inherit from object, to be consistent
look for "EP" and such in name to identify EPs too
fix so files with no metadata get path structure

i.e. wav files
some jinja StrictUndefined fixes
give a artist_name_fallback in upload for regular audio files

so they'll get something if they don't have proper tags, avoiding
everything getting bundled up under 'Unknown Artist'
fixed pagination, responsive and shit