modules/playit: add an .IT file music player module

Rudimentary .IT file music playback via libplayit.

When seekable=on, the file is 100% pre-rendered at context
create, then simply copied into the audio queue @ render_audio.

When seekable=off, the file is mixed incrementally per-frame @
render_audio in max of bufsize=N_frames increments.  The bufsize
here basically just determines the maximum time spent rendering
audio in a single go, and how much tolerance of frame delays due
to slow rendering there will be before dropouts occur.

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