An Edit of Vanilla GUI Classes to Allow Layer-Based Rendering

[FireTamer81]

I have no idea how this might work, I am honestly not to that level of coding yet (nor my understanding of forge), but I have recently attempted making a GUI with movable components and found that rendered string (and possibly other things I hadn't found yet) rendered behind the movable GUI components. 

I had asked on modder support, but even diesieben07 wasn't able to figure out what was going on after a short local test of my mod (please ignore my lack of experience with Github):

So, perhaps for the newer versions of Forge, some edit to the vanilla GUI stuff to allow layer-based rendering, or just something to fix the issue in the linked post.