An attempt at Vulkan

Both GLES 3.0 and WebGL2 support UBOs, so that wouldn’t be a problem. SSBOs are not supported in WebGL2, though. zzuegg: > We could generate them at compile time, and then work with plain glsl/spirv during execution. it of course needs a fair bit of magic, and the big problem is the currently used int defines. Makes sense, we can put this on a gradle task or something