Add functions to build UI elements

[roipoussiere]

Some functions could be added to allow the user to create UI elements and interact with them in real time.

Imagine a live performance where one artist writes code to make fun sounds and builds an interface on stage for an other artist who actually creates the music with it.

Some UI elements ideas:

• drop-down menu
• switches
• buttons
• matrix pad
• slider
• potentiometer
• drawing area
• microphone (to record sound samples)?

The API must be discussed, but I think it's important to both allow:

• state-based approach, ex. .cutoff(my_slider.getValue());
• event-based aproach, ex. my_button.on_pressed(btn => { s("bd") } ).

I would love to try to work on it. :)

[felixroos]

yep this is a planned feature, see https://github.com/tidalcycles/strudel/discussions/353 implementing things directly in the repl is also a fun way to share / discuss ideas, for example https://strudel.tidalcycles.org/?STsblGtree5S