get songname in JS vor midi-sysex output

Registered by Michael S.

Make possible in JS files reading out songname and other MP3 informations from deck. Like this...
engine.getValue(deck, "ID3songname")
engine.getValue(deck, "ID3remark"). -> this is neccessary to generate a explicit number to transfer like *#000001*
engine.getValue(deck, "ID3album")
... and so on

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