Investigate and/or use Web Workers for the state engines, which allow the instant delay & history features

[slowlydev]

Investigate if it would make sense to refactor the state engines to use web workers so they are more parallel and maybe more performant.

One thing that would need changing is the loop which checks for correct frame, which is currently using requestAnimtionFrame and I do not think this API is accessible to web workers, so we might would need to use setInterval.