feat(math): Support MathML mtext and ms elements

[Omikhleia]

Ticking one box in #2138

I am on a quest, sort of...

So let's derive the Quadratic Formula.

[OlivierNicole]

This looks like a good working first step. Note that one day we probably want to be able to use SILE commands in \text, just like arbitrary TeX formatting can be applied inside a \text{...}…

[Omikhleia]

Note that one day we probably want to be able to use SILE commands in \text, just like arbitrary TeX formatting can be applied inside a \text{...}…

But I'd advocate against it, as far as I have a word to say. It's not a "common" denominator for any real use case.

[Omikhleia]

But I'd advocate against it, as far as I have a word to say. It's not a "common" denominator for any real use case.

"Note that one day we probably want to be able to use SILE commands"... Really? Folks, please be much more precise, do you mean SIL in its TeX-like syntax? (as \em and that sort of stuff?). Do you imply there's a real added value in general for this to be true? Do you have, I dunno, a real book project where you desperately need such a thing?

Had you said: "one day we probably want to be able to use Markdown, Djot or other markup in \text", I'd would have raised an eyebrow with interest.

How long does it take for you to understand that SIL is a dead end?

[Omikhleia]

BUT let's go back on topic; there's a PR here, does it pass the bar? Something is better, sometimes, than an idealized nothingness.