D10918: taglibextractor: Refactor for better readability

[Alexander Stippich]

astippich added a comment.


  Btw, I'm not opposed anymore for merging before D10803 <https://phabricator.kde.org/D10803>, as I need some more time to think about the value types and probably also need to extend the tests. I will adapt to the changes afterwards.

REPOSITORY
  R286 KFileMetaData

REVISION DETAIL
  https://phabricator.kde.org/D10918

To: michaelh, mgallien, #baloo, #frameworks
Cc: astippich, ashaposhnikov, michaelh, spoorun, nicolasfella, alexeymin
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