Occasional clicks/dropouts/crackle when performing with Playtime

[Benjamin Klum]

This ticket includes only those audio issues that happen when interacting with Playtime within a performance - triggering/recording/deleting/copying/pasting/moving clips, stopping groups, triggering/building scenes, tempo detection, navigating through the cells, scrolling etc. - all things where it really hurts.

It doesn't include audio issues that occur when closing/opening UI, doing things with more of a configuration character ... this will become a separate ticket with a slightly lower priority.

[Benjamin Klum]

re #287 Decrease likeliness for clicking when undo point created

→ <<cset 2aab3667e025>>

[Benjamin Klum]

re #287 Move lambdas if possible when dispatching to main thread

→ <<cset a36b4fd094d2>>

[Benjamin Klum]

re #287 Decrease likeliness for dropouts by dispatching via lock-free queue

→ <<cset 92d3be0e0d9f>>

[Benjamin Klum]

re #287 Lock only on beat/play/pause/stop step 1

→ <<cset ed72eb38fe8c>>

[Benjamin Klum]

re #287 Lock only on beat/play/pause/stop step 2

→ <<cset a56441f6c9a7>>

[Benjamin Klum]

re #287 Lock only on beat/play/pause/stop step 3 (last one)

→ <<cset 2e46cb3891db>>

[Benjamin Klum]

re #287 Fix 'Play clips with arrangement' regression

→ <<cset 6042c88f121a>>