Initial project import

tools/v/vlib/stbi/README.md

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+## Description
+
+`stbi` is a thin wrapper around [stb](https://github.com/nothings/stb)'s stb_image.h, which in turn
+is "a public domain image loader" for popular graphics image file formats.
+
+By default, `stbi.load` and `stbi.load_from_memory` convert images to 4-channel RGBA pixel data.
+`Image.nr_channels` reflects that in-memory layout, while `Image.original_nr_channels` keeps the
+channel count from the source file as metadata.
+
+When uploading to `sokol.gfx`, size the upload from `width * height * nr_channels`.
+If you load with `desired_channels: 0`, convert the data yourself or use a matching pixel format
+before creating a texture.
+Also call `gfx.setup(...)` before `gfx.make_image(...)` and `gfx.make_sampler(...)`.