Conversion of ID3v23 to ID3v24 shoudnt convert all of IPLS frame to TIPL some TMCL

Conversion of ID3v23 to ID3v24 shoudnt convert all of IPLS frame to TIPL, roles such as producer should go in TIPL but vocal/instruments credits should go to TMCL

Two problems:

We don't have a solid mechanism for splitting one frame to multiple (although we do something for ID3v24 TDRC when converting to ID3v23.
If not a standard function as defined in StandardIPLSKey should it go into TIPL or TMCL, dont know for sure as there are many functions not defined that can go into TIPL such as 'art direction'

There is no cast iron way to do this but we could at least take a series of instruments and vocal types from musicbrainz and use as a list from which to move to TMCL

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