D13700: implement reading of the replaygain tags

[Alexander Stippich]

astippich added inline comments.

INLINE COMMENTS

> bruns wrote in taglibextractor.cpp:255
> you can use TStringToQString
> `data.replayGainTrackGain = TStringToQString(userTextFrame->fieldList().back());`

toCString() was actually completely unnecessary. I removed it since convertWChartsToQString() avoids the UTF16->UTF8->UTF16 conversion of TStringToQString

REPOSITORY
  R286 KFileMetaData

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

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