Add CircuitPython Types to Code Mirror

[makermelissa]

This would allow it to recognize additional variable/class types specific to CircuitPython and color code correctly.

[makermelissa]

I've been going through the CodeMirror 6 documents and language examples to try and find a way to add keywords. In CodeMirror 5, there was a way to do it with an extra_keywords argument, but that was removed in version 6.

There really is no simple way to do this because there appears to be no way to simply extend the keywords. The only way I've seen is to write a new language package based on Python and include the keywords. It would need to be maintained, which could present its own challenges as the language matures.

I'm going to put this on hold for now as it seems to be a bit of a rabbit hole.