Small bugfix release with a couple of other improvements.

0001365: [Accessibility] Keyboard focus placement problems in some UI parts (Saga Musix)
0001427: [User Interface] Add shortcuts for adding channels (Saga Musix)
0001382: [General] OPL Instrument view breaks shortcuts for general, pattern, instrument and comment view (Saga Musix)
0001418: [Audio I/O] Simplify output sample format (manx)
0001412: [libopenmpt] Load incorrectness on a specific S3M file (Saga Musix)
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