Add sensible keyboard colour defaults

[SeanArchibald]

Looking for assistance on key colouring defaults. No programming skills required, but you'll need an understanding of rearranging keys on a Halberstadt style keyboard.

Scale Workshop lets users choose a custom keyboard colouring scheme for your scale. There is an 'Auto' button which checks how many notes are in your scale and then provides a sensible default scheme.

Currently it only provides a scheme for a few easy ones such as 10, 12, 13, 16, 17, 19, 22. It would be a good enhancement to review the existing schemes I added and add missing schemes for scales with a different number of notes.

To add/edit new schemes, open up file scale-workshop/js/events.js and search for "case" - that will get you to the right place. There are examples there so you can follow the existing pattern. Example:

      case "12":
        colors = "white black white white black white black white white black white black";
        break;

[SeanArchibald]

I have added default key colour layouts for scales of size 9 through to 24. If anything else is needed it can be requested. Going to close this for now.