Intergrate `global.flag` labels into the code editor (Undertale, Deltarune, Undertale Yellow)

[VladiStep]

Which component should be improved?

UI/UX

Describe your feature suggestion in more detail

For Deltarune, Undertale, and Undertale Yellow source code, there is a website that allows you to see it with labeled global.flag occurences, like so:

It would be neat to make the code editor display the friendly name of the flag, probably adding a hover text for global.flag occurences (I think AvaloniaEdit allows you to do that).
The flag names are available here (though, not for Deltarune Chapter 3&4 at the time) - https://github.com/utdrwiki/code-viewer/tree/master/data

[VladiStep]

To make it clear that the flag name is not official, the hover text should like something like:

global.flag[123] = "some_flag_name"
It's not an official flag name.

[Determined-Memories]

Fun Fact, Chapters 3&4 of Deltarune has a global.flagname (According to my memory that's the name) array variable that is likely meant to store flagnames, but is only set to compile while Debugging

[vrad-exe]

Tenna Save Editor has a more complete list of Chapter 3 and 4 flags, could also use that as a reference.

And yeah the official flag names being stripped out pisses me off lol. It's actually the reason chapter 4 debug mode crashes out of the box.