Start migration from cbindgen to bindgen

[ncharlton02]

Fix for #78 - has rust types generated by the header instead of vice-versa. Currently still needs a lot of work (most of the original codebase is deleted 😞 ) but I am slowly reimplementing everything with the generated types. Currently the triangle and compute examples should work on Windows and Linux. Anyways, thought I would post this here to get initial thoughts before I finished adding everything.

Big changes

• all of the header types are generated at build time and inserted into the crate::native module
• enums are mapped from their c types to wgt using a macro (map_enum!)
• two c headers (ffi/webgpu.h for things in the webgpu-native headers, and ffi/wgpu.h for stuff unique to wgpu-native)

Small Notes

• auto-generated bindings are modified at build time to change all of the *Impl to Ids (BindGroupImpl -> wgc::id::BindGroupId)
• libclang now required to build (required by bindgen)
• enum constants are i32 on windows and are u32 on macos/linux
• example shaders are now written in WGSL
• Had to change some of the makefiles for windows c development (if anyone has a better way to write makefiles please let me know 😄)

Stuff that still needs to be added

• MacOS Surfaces
• Wayland Surfaces
• most commands
• undelete / update the capture example
• logging
• Textures
• Fix IOS
• Include webgpu.h in release CI

[kvark]

@devorc this is absolutely critical work, even if it's very routine. I don't know how to express the gratitude to you for doing this! 🥇

[kvark]

Is this ready to go?

[ncharlton02]

Almost - need to finish porting some of the functions. Will probably be ready by tonight or tomorrow.

[kvark]

bors r+

[bors]

Build succeeded:

• Android Stable
• iOS Stable
• MacOS Nightly
• MacOS Stable
• MacOS Stable (Vulkan)
• Ubuntu Nightly
• Ubuntu Stable
• Windows Nightly
• Windows Stable