Now that we have SDL_GPU, we can remove our old Vulkan renderer. And since it was the only backend that used FNA3D_Memory and FNA3D_CommandBuffer, we can delete those along with it!
Still need to test VisualC-GDK and Xcode, but the other build systems are happy with this change.
Marked as a draft until #219 is done - this will be removed in 25.01 at the latest but if threading support gets done early we could probably do this a month early...
Now that we have SDL_GPU, we can remove our old Vulkan renderer. And since it was the only backend that used FNA3D_Memory and FNA3D_CommandBuffer, we can delete those along with it!
Still need to test VisualC-GDK and Xcode, but the other build systems are happy with this change.