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Added backend support for Vulkan and GLFW. Changes mostly follow the structure of the DX12 implementation.
Vulkan implementation files grabbed from https://github.com/ocornut/imgui/tree/v1.91.0/backends.
Only other difference from the other implementations is adding a de-gamma'd vertex shader binary in the Vulkan implementation, which is toggled by introducing a custom C flag.
The per-vertex colors by ImGUI are in sRGB, but when they are passed from vert to frag, they are interpolated, and the colors should have been linearized before this operation. Since these are corrected colors, I didn't see a reason to add a build flag for on/off on zig side.
Minimal example can be found here (project consuming zgui)
https://github.com/nfginola/vk-zig/blob/main/src/vk_gui.zig