ID3_v2 fields BPM, Grouping, Key and Date added to abstract ID3_v2 as we...

...ll as RecordingTime to ID3_v24

Fixed missing opportunity to get and set the ID3_v2 fields
BPM: TBPM (v22: TBP)
Grouping: TIT1 (v22: TT1)
Key: TKEY (v22: TKE)
Date: TDA (v22: TDA)
in ID3v2 and AbstractID3v2Tag and added new field
'recording time' (TDRC) for v24 in ID3v24Tag