Pull marquee stepping out of Redux

[captbaritone]

Marquee stepping happens continuously at a relatively rapid frequency. Keeping this data in Redux means we need to run many selectors every time we step. By moving this state into React local state we can reduce the amount of work that is needed on each step.

[github-actions]

Size Change: -56 B (0%)

Total Size: 450 kB

Filename	Size	Change
./packages/webamp/built/webamp.bundle.min.js	272 kB	-31 B (0%)
./packages/webamp/built/webamp.lazy-bundle.min.js	178 kB	-25 B (0%)

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