[3.0] Add multi-platform generation and finish initial OpenXR bindings

[Exanite]

Summary of the PR

(TODO)

A short summary of this PR and what it adds/removes/fixes.

Related issues, Discord discussions, or proposals

Links go here.

Further Comments

Tasks from tracker

• OpenXR/CL/Vulkan: Add CurrentInstance/Device/Platform properties to interface partial.

Platform interop / additional headers:

Most Khronos APIs have additional headers that interop with platform-specific/other Khronos/other graphics APIs.
OpenXR notably will not work without these additional headers, but generating bindings for these headers requires additional work. See this to understand the planned solution: https://discord.com/channels/521092042781229087/587346162802229298/1529139068288503900

• Note down what headers are not being scraped for each Khronos API
  • Eg: Vulkan:
    • header.h
• Add aforementioned headers to each bindings generation process
• Investigate OpenCL empty enums
  • Most of these should be populated once the other headers are included
  • cl_command_buffer_info_khr
  • cl_command_buffer_properties_khr
  • cl_command_buffer_state_khr
  • cl_command_buffer_update_type_khr
  • cl_command_properties_khr
  • cl_compiler_mode_altera
  • cl_d3d10_device_set_khr
  • cl_d3d10_device_source_khr
  • cl_d3d11_device_set_khr
  • cl_d3d11_device_source_khr
  • cl_dx9_device_set_intel
  • cl_dx9_device_source_intel
  • cl_gl_context_info
  • cl_gl_object_type
  • cl_gl_texture_info
  • cl_layer_properties
  • cl_media_adapter_set_khr
  • cl_media_adapter_type_khr
  • cl_mutable_command_info_khr
  • cl_mutable_dispatch_asserts_khr (Flags so by default 1 None member)
  • cl_mutable_dispatch_fields_khr (Flags)
  • cl_platform_command_buffer_capabilities_khr (flags)
  • cl_queue_properties_khr
  • cl_semaphore_reimport_properties_khr
  • cl_svm_alloc_properties_khr
  • cl_svm_capabilities_khr (Flags)
  • cl_svm_free_flags_khr (Flags)
  • cl_svm_free_properties_khr
  • cl_svm_pointer_info_khr
  • cl_va_api_device_set_intel
  • cl_va_api_device_source_intel
• Also investigate any other empty enums, if there are any. Make sure to check for [Flags] enums as well, since these will not be empty and instead have a single None member.

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