AbstractId3v2Tag
-----------------
- added asynch Lyrics ID at line 32
- added getter for asynch Lyrics at line 662
- added setter for asynch Lyrics at line 668

- extractTextFrameData at line 802 changed to protected
- invalidateDataLength at line 295 changed to protected

ID3v24Tag
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- added year ID (TDRC) at line 7
- getter for Year at line 56
- setter for Year at line 64

ID3v2
------
- added asynch lyrics getter and setter at line 53 und 54

ID3v2TagTest
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- added a test for new id3v24 year and asynch lyrics at line 417

- added the file ID3v24YearWithLyrics.mp3