First Major Version! (22.0)

Theres only a few things here. First all the shader related config structs now have a compilation_options field. For now I'm just leaving it as Default::default(), but if you have specific compilation needs it's there for you.

The next thing is RenderPipelineDescriptor and ComputePipelineDescriptor now have a cache field. This allows you to supply a cache to use during shader compilation. This is only really useful for Android devices as most desktop hardware/drivers provide caching. I've left it as None for now.

DeviceDescriptor now has a memory_hint field. You can use this to ask the gpu to prioritize performance, memory usage, or allow you to request a custom memory block size. These are just hints though and the hardware has the final say in how to do things. I've left this as Default::default() for now.