Feature: WGPU renderer

[cohaereo]

Using WGPU instead of glow (OpenGL) will allow Eurochef to multithread rendering, and have better platform support, especially for macOS and web.
eframe already supports WGPU, so the renderer is the only thing that needs to be rewritten, though that's no easy task.

The benefits outweigh sticking to OpenGL, but I will need to take in some further consideration before we start making the move