Add initial support for undo/redo #13
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This PR adds support for undo/redo of certain operations on loopers:
Currently undo stacks are maintained on a per-looper basis, and the UI buttons are configured to send to the current looper.
As undo/redo operation can change the looper length and state in unpredicatble ways, we can no longer reasonably track those separately in the frontend and backend. Now, they live solely in the backend and are shared with the frontend in a lock-free manner via
Arc<Atomic<_>>.