Fixed some MSVC warnings in DSF related classes
Avoid using sprintf() in tagreader.cpp to fix an MSVC warning.
Merge pull request #352 from TsudaKageyu/tagreader-sprintf

Avoid using sprintf() in tagreader.cpp to fix an MSVC warning.
opus: Estimate the bitrate if possible
Merge pull request #354 from TsudaKageyu/opus-bitrate

opus: Estimate the bitrate if possible
Merge branch 'master' into merge-master-to-taglib2

Conflicts:
	taglib/ogg/opus/opusproperties.cpp
Merge pull request #355 from TsudaKageyu/merge-master-to-taglib2

Merge master to taglib2
Merge pull request #326 from TsudaKageyu/msvc-dsf

Fixed some MSVC warnings in DSF related classes