[Feature Request] Add loop modes to slicerT

[thismoon]

Enhancement Summary

Add loop modes to slicerT similar to the ones in AFP
loop modes determine the behavior of slicerT when a slice finishes being played
here is my suggestion for what modes should be implemented (they are identical to AFP's modes except for the last one):

• disabled: when a slice finishes playing it stops producing sound
• loop: when a slice finishes playing it replays again until the note ends
• mirror: when a slice finishes playing a reversed version of it plays, when that version finishes a normal version plays and so on
• continue: when a slice finishes playing it automatically plays the next slice as it was a normal sample and not sliced

Implementation Details / Mockup

I don't currently have a mockup but it should be implemented similar to how it's implemented in AFP
four buttons. only one can be activated at a time. it affects all the slices
i think there's a lack of space issue that can be fixed by making that top preview panel shorter

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