Add initial code from Vello.

[simbleau]

This PR initializes the repo to a basic state.

[xStrom]

I had time to only quickly skim a few files, but I already have a few comments inline.

The unifying idea of my complaints is that I think we should stick more closely to established Linebender culture. Not to say that these things are unchangeable forever, but at the very least this initial seed is the wrong place to start changing such things.

[simbleau]

I had time to only quickly skim a few files, but I already have a few comments inline.

The unifying idea of my complaints is that I think we should stick more closely to established Linebender culture. Not to say that these things are unchangeable forever, but at the very least this initial seed is the wrong place to start changing such things.

They were good comments, thanks for the initial review.

[xStrom]

Here's another pass. Might have missed something, because looks like the fork wasn't based on the freshest main of the Vello repo. Although I guess we don't necessarily need all of that, like vello#435?

[xStrom]

I think we've reached a state where this can be merged. 🎉

Before merging, I'll note two things:

• The PR title should be changed (I'll just do it myself in a second)
• Use the Squash Merge option to do the merge, as that is the Linebender way

Thanks for putting in the effort to get this landed!