main change is that the Vulkan backend is now stable; no longer
experimental
upstream is planning to default to Vulkan in the future after some more
testing time; for now OpenGL remains the default
At this point, Vulkan can be tested with FNA games by setting
FNA3D_FORCE_DRIVER=Vulkan or appending /gldevice:Vulkan to the runtime
command
see https://github.com/FNA-XNA/FNA/wiki/7:-FNA-Environment-Variables
tested with Rogue Legacy and Celeste without issues, including OpenGL and
Vulkan backends
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