server side scheduling

[felixroos]

as requested by @treethought it would be handy if the server could evaluate and schedule patterns. this would allow using strudel with other editors, communicating via websockets.

1. external editor sends user code to server via websocket
2. server evaluates code
3. server schedules active pattern and triggers osc messages (could work with midi too)

it could also be helpful if the server also sent scheduling messages via websocket to the client, allowing external playback or highlighting.

we could even try to use https://www.elementary.audio/docs/packages/node-renderer and render audio on the server

as @yaxu pointed out, it would be handy to have a standalone scheduler that works in the browser as well as in node, which should also support cps . vortex implementation: https://github.com/tidalcycles/vortex/blob/c575fa595d8cf537a7b59815a2e3dcdc14eec351/py-vortex/py_vortex/stream.py#L91

related #51