Menu: dynamic focus wrapping

[BossGoblin]

Hey! Just wanted to share my script that has some fixes to the GridContainer auto-wrapping. There are a few other helper functions added, as well - one of which is setup_focus_neighbors() for wrapping neighbors on a base Control, so it can wrap or grab the autowrap dynamically if some objects get removed, too. I guess this would technically be a branch, but I'll post it here to just play around with.

menucopy.md

[sealionnn]

Hey, thanks for sharing this. When you posted this, I didn't really know what I was doing in Github, but I've been getting better at it.

I know I fixed GridContainer wrapping in an update between this issue and now, but I will have to check out your implementation for comparison. Your other change sounds interesting too since, if I remember correctly, the menu does not currently update auto-wrapping outside of _ready.

[sealionnn]

PS: I think this is something that, in the future, would be best linked to a pull request, so that I could see your code changes in comparison to the existing script. I haven't worked with pull requests yet, so I am not totally sure.