Godot

Hello, I just wanted to make a small proposal to this wonderful crate. Namely, to improve the ergonomics for when using a custom build of godot.

Problem
The problem is as such, a user wants to use godot-rust with a custom build of godot so they need a custom build of gdnative-bindings to use godot-rust. The current process is nicely documented [here](https://godot-rust.github.io/book/a

Regarding Revolutionary-Games/Thrive#2649 I realized that if we want the tooltip to say the max amount of toxin to shoot at once, we need a new bbcode tag that can show the values from Constants (and probably in the future some JSON loaded stuff). Basically should have a big switch statement of allowed values to show and then just find that number and format it into the t

Currently it looks like that:

We could use a UI theme there. I'd also rather use styleboxes and piggyback on button and similar nodes than use custom textures.

When a player updates their current skin or display name on the options screen while in a game (multiplayer or singleplayer), it should update as soon as the player exits the options screen.