Add settings panel ui for configuring editor parameters

[ojack]

Proposal to add a ui for configuring editor parameters.
Some ideas:

1. Pixel scaling of canvas (seems more useful than resolution often)
2. Frame rate
3. keymap configuration
4. Whether to include p5.js (possibly other libraries)
5. Font and styling (or possible a theme)
6. (eventually) autocomplete and editor language

Some or all of these parameters can also be saved with the sketch url.

Related issues and pull requests: https://github.com/ojack/hydra/pull/155,

[geikha]

I'd add main canvas interpolation too (#145) next to pixel scaling