D13700: implement the replaygain tags

[Alexander Stippich]

astippich created this revision.
astippich added reviewers: mgallien, bruns.
Restricted Application added projects: Frameworks, Baloo.
Restricted Application added subscribers: Baloo, kde-frameworks-devel.
astippich requested review of this revision.

REVISION SUMMARY
  add the ability to read the replaygain_{album/track}_{gain/peak} tags
  the implementation can succesfully read the tags generated by MediaMonkey
  mp4 files are not supported

TEST PLAN
  tests pass

REPOSITORY
  R286 KFileMetaData

BRANCH
  replaygain

REVISION DETAIL
  https://phabricator.kde.org/D13700

AFFECTED FILES
  autotests/samplefiles/test.flac
  autotests/samplefiles/test.mp3
  autotests/samplefiles/test.mpc
  autotests/samplefiles/test.ogg
  autotests/samplefiles/test.opus
  autotests/taglibextractortest.cpp
  src/extractors/taglibextractor.cpp
  src/extractors/taglibextractor.h
  src/properties.h
  src/propertyinfo.cpp

To: astippich, mgallien, bruns
Cc: kde-frameworks-devel, #baloo, ashaposhnikov, michaelh, astippich, spoorun, ngraham, bruns, abrahams
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