Dependencies for openxr-0.1

Derive Generic instances for all structs. Disabled by default because of code size and compile time impact.

Do not mark foreign imports as unsafe. This means that callbacks from OpenXR to Haskell will work. If you are using these then make sure this flag is enabled.

Inserts calls to Debug.Trace.traceEventIO around every OpenXR call.

Reexport handles and structs from the vulkan package instead of defining them in OpenXR.VulkanTypes. Disable this to avoid a dependency. on vulkan