Create constants for the song's type field

[ddurham2]

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It would be helpful if there were named constants for the value of a song's type field.

At the same time it would be most helpful to have all the values of type figured out since naming the constants probably would be helped by knowing them.

So far all we know about is 1, 2, 6, and 7.

7 is probably the current maximum since it means its an All Play track and that's the most recent major feature right now.

Has anyone seen a 3, 4, or 5?