accessibility (colorblind options)

[jepyang]

A couple things have come up while working in Inform that could be improved to make it more accessible to colorblind people. I have red/green colorblindness, and it's a pretty common disability.

On the testing tab, the 'knots' of the skein are color coded, and the blue and purple colors look identical to me.

Most of the default color palettes have text colors that are hard to differentiate—easy to work around with a custom palette, but would be nice to have something more accessible included.

Not strictly a colorblindness thing, but the text cursor stays black when switching to dark mode, making it difficult to find.

Mac M1 Pro MacOS 12.6 Inform 1.82.3