An example of using wgpu 0.13 (Vulkan) with OpenXR.
Cobbled together from the following sources:
- https://github.com/gfx-rs/wgpu-rs/blob/7501ba1311c45c57cf4e361556ab46431478adb4/examples/hello-vr-triangle/main.rs
- https://github.com/gfx-rs/wgpu/blob/b65ebb4b308228287cdb559b624ce3ac3ba71bd2/wgpu/examples/hello-triangle/main.rs
- https://github.com/Ralith/openxrs/blob/a6a7d9c00afc5b8d9aa9eb19c692aaf1a7fa6d16/openxr/examples/vulkan.rs
- https://github.com/gfx-rs/wgpu/blob/b65ebb4b308228287cdb559b624ce3ac3ba71bd2/wgpu-hal/src/vulkan/adapter.rs
- https://github.com/gfx-rs/wgpu/blob/b65ebb4b308228287cdb559b624ce3ac3ba71bd2/wgpu-hal/src/vulkan/instance.rs