Add a tree table view widget

[ddkwork]

[kkoreilly]

This is on our list of things to do, but we have to finish other things first. It should be done relatively soon though.

[kkoreilly]

I will work on implementing the tree table at some point relatively soon after I finish some other things.

[kkoreilly]

Please do not worry. I have a plan for how to implement the tree table, and I will work on it as soon as I have time. The tree table is a lower priority for me than other things that have to happen before a v1 release, but I should get around to it in not too long.

[kkoreilly]

I will work on implementing the tree table widget as soon as I have time.

[ddkwork]

I've implemented various tree tables with unison, so to save you, I'll close this topic, and also the other topics about the code editor can be closed, since I've implemented syntax coloring with unison.

[kkoreilly]

It is great that you have implemented tree tables in unison and fine that you do not want to use Cogent Core for them, but that does not mean that we do not want to implement tree tables eventually, so this issue is still relevant and will stay open.

[ddkwork]

I also maked another one use gio

https://github.com/ddkwork/ux

[kkoreilly]

@ddkwork Thanks for the update; that looks cool. We will implement a tree table widget in Cogent Core later once we have the time.