Improve parsing of special ID3 tags

[kartik-venugopal]

"nonEssentialMetadata" : {
"MusicBrainz Release Track Id" : {
"format" : "id3",
"key" : "MusicBrainz Release Track Id",
"value" : "fc674ae7-2bc2-40ad-940c-ecaec1614fc9"
},
"TMED" : {
"format" : "id3",
"key" : "Media Type",
"value" : "CD"
},
"TPUB" : {
"format" : "id3",
"key" : "Publisher",
"value" : "Maverick"
},
"TSO2" : {
"format" : "id3",
"key" : "TSO2",
"value" : "Madonna"
},
"TSOP" : {
"format" : "id3",
"key" : "Performer Sort Order",
"value" : "Madonna"
},
"TSRC" : {
"format" : "id3",
"key" : "ISRC",
"value" : "USWB19701739"
},
"UFID" : {
"format" : "id3",
"key" : "Unique File Identifier",
"value" : "http://musicbrainz.org\nc36eb72b-0add-402a-a22e-2f044363b8cf"
}
},

---

"nonEssentialMetadata" : {
"TSSE" : {
"format" : "id3",
"key" : "Encoding Tool",
"value" : "LAME v3.96.1"
}
},

---

"nonEssentialMetadata" : {
"COMM" : {
"format" : "id3",
"key" : "Comment",
"value" : "Aus Compilation "Perspective""
}