openxr

VulkanGraphicsPlugin should destroy the VkDevice and VkInstance it owns on destruction rather than leaking them. This allows the Vulkan validation layers to detect resource leaks, which is useful for finding bugs both in hello_xr itself and in runtimes that use hello_xr with the validation layers as a smoke test for correctness.

The destructor hangs at pipe.stop().

It's been brought up in the most recent dev meeting that the codegen subsystem could be migrated from Python to WebAssembly (on WASI). There are several advantages to this:

• Removing the Python dependency; decreasing setup complexity
• Compact runtime for generating all classdef outputs
• A language like AssemblyScript may be more appropriate for codegen than Python

This would be implemen