playit: add public playit api

The schism stuff isn't really appropriate for external use, its headers
want to include its config.h.  So this just keeps all the schism interfacing
private to libplayit where the schism code resides, and the public api is
all new with no dependency on the schism code for a clear separation.

While at it I've added a seekable flag which renders the song in-memory
for easy and accurate seeking within the rendered output.

Note this commit obsoletes the examples in examples/* which were really
only intended as examples of how to do rudimentary playback with the
stripped down schism code.

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