allow customisation of underlying NS/UI TextView

[ConfusedVorlon]

This adds an optional param to the initialiser so that you can customise the underlying TextView.
In my case, I wanted to make it non-editable (It's just for previewing code)

    CodeEditor(text: .constant(file.objCBody),
               position: $position,
               messages: $messages,
               language: .swift,
               layout: .standard) {
        textView in
        textView.isEditable = false
    }

I forked from the current release as main doesn't build for me - but if you're open to this then I can redo against the head.

[mchakravarty]

Thanks, that is an interesting extension and I'd be happy to include it. I would suggest one change. Currently, the file OSDefinitions.swift includes aliases for types where AppKit and UIKit use different names. Hence, CETextView should go there and be named OSTextView to be in line with the other names.

What are the specific problems with building main for you? (A while a go, there was a missing dependency, maybe you tried to build then. In case that was the problem, it should be fixed now.)

[lgreydev]

Thank you @ConfusedVorlon

[srazzell]

I would love this feature too.