Forget memorized slots after recording with "Write"

[Benjamin Klum]

Intentionally forgetting memorized slots after pressing stop while Write mode enabled makes sense if "Play clips with arrangement" is enabled because we can assume that the user doesn't want to hear both the Playtime clips and the written items at the same time when he presses Play again.

[Benjamin Klum]

re #166 Intentionally forget memorized slots after pressing stop while Write mode enabled

→ <<cset 20c3ef3fbb22>>

[Benjamin Klum]

re #166 Forget memorized slots only if 'Play clips with arrangement' is enabled

→ <<cset a79589539adf>>