Update/refine script's name (make it more grammatically correct).
Refactor script extensively and fix status reporting.

- Fix code formatting
  * brackets pad outside
  * convert indentation to be uniform
  * pad binary operators with spaces

- Regroup audio track list into 4 levels
  * owner as "genre"
  * artist as "artist"
  * fake entry as "album"
  * title as "title"
  -> hence tracks get correct artist and title data, so at least
     lyrics search works (and less pain when importing tracks)

- Fix status reporting (vk.com changed track storage URL format)
Fix trim() function.
Unify readTrackList() and readSearchResults() and simplify onPopulate().