This is a (rather badly written) example of how to integrate DVUI with some
advanced Wayland features, such as `wlr-layer-shell-unstable-v1`, aka layer
shell protocol.

In `src/sdlCustomInit.zig`, I basically copied the SDL backend initialization
and added some hacks to intercept window initialization process and make it not
depend as much on the framework code. Gladly, there are not that many hacks,
the biggest one is `const sdl3 = true` up top. The DVUI backend supports both
SDL3 and SDL2, I make an assumption that you are only going to run SDL3.

Another assumption is that SDL is going to choose the Wayland backend and not
XWayland. If it crashes and mentions XWayland in logs, set `SDL_VIDEO_DRIVER`
environment variable to `wayland`.

```
export SDL_VIDEO_DRIVER = "wayland"
```

Then run it through `zig build run`.