Added proto version of jar_xm

This is an early draft, needs lots of work. Still need to figure out way
to calculate total length of song. This is hard because xm tracks stream
out zeros when done, only position in track can be found. Position does
not give any direct value of how much more time is left. I think that by
setting the loop count to 1 and seeking until the end I can total up the
number of samples and come up with a length.

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