midi looping fixes

I just pushed a bunch of commits that should at least massively improve
MIDI looping, and at best fix it completely.

I'd appreciate it if anyone with an interest in such things testing out a
nightly or self build (starting with nightly builds from September 14th).
The more people that play around with it, the higher the chance that we
catch some aspect that I failed to test.

Please note: this only covers *playback*. It does not affect MIDI loop
recording (the status of which I don't know right know).

--p

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