WGSL Naga errors are unclear

[JackYoustra]

https://shader-playground.timjones.io/ab65b6f42d3ece71085e65c732c3edf9

Naga errors this code, but the error message has an unnecessary timestamp and is full of color control keys.

We can either strip or use these. I'm not familiar with this project and haven't contributed before, but color usually looks good so I'll try and preserve the color.

[JackYoustra]

It appears that codemirror has no support for ansi colors. See: codemirror/codemirror5#5384

An alternative could be replacing the codemirror output box with an ansi-up html box (see https://github.com/drudru/ansi_up) on an error. I will try that

[JackYoustra]

That did the trick. PR up in a few!

[tgjones]

Fixed by #104.