Implement a unit generator-only micro version of Flocking that can be used in an AudioWorklet

[colinbdclark]

In the long term, the best approach to this will be to port all of Flocking's unit generators to Signaletic in C. But for now it would be nice to have access to just Flocking's unit generators without the weight of the rest of the framework, which has been languishing for a long time.