Vendor dependencies for 0.3.0 release

vendor/glow/README.md

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+<h1 align="center">
+  glow
+</h1>
+<div align="center">
+  GL on Whatever: a set of bindings to run GL anywhere (Open GL, OpenGL ES, and WebGL) and avoid target-specific code.
+</div>
+<br />
+<div align="center">
+  <a href="https://crates.io/crates/glow"><img src="https://img.shields.io/crates/v/glow.svg?label=glow" alt="crates.io"></a>
+  <a href="https://docs.rs/glow"><img src="https://docs.rs/glow/badge.svg" alt="docs.rs"></a>
+  <a href="https://github.com/grovesNL/glow/actions"><img src="https://github.com/grovesNL/glow/actions/workflows/ci.yml/badge.svg?branch=main" alt="Build Status" /></a>
+  <img src="https://img.shields.io/badge/min%20rust-1.73-green.svg" alt="Minimum Rust Version">
+</div>
+
+## Build commands
+
+```sh
+# native
+cargo build
+
+# web-sys
+cargo build --target wasm32-unknown-unknown
+```
+
+## License
+
+This project is licensed under any one of [Apache License, Version
+2.0](LICENSE-APACHE), [zlib License](LICENSE-ZLIB), or [MIT
+license](LICENSE-MIT), at your option.
+
+## Contribution
+
+Unless you explicitly state otherwise, any contribution intentionally submitted
+for inclusion in this project by you, as defined in the Apache 2.0 license,
+shall be dual licensed as above, without any additional terms or conditions.