drogus/jawsm: JavaScript to WASM compiler

Jawsm (pronounced like "awesome") is a JavaScript to WebAssembly compiler written in Rust. It is similar to porffor in a way it also results in a standalone WASM binary that can be executed without an interpreter, but it takes a different implementation approach. It's an experimental tool and it's not ready for production. A lot of the language features and builtin types are missing or incomplete. That said, my goal is to eventually support 100% of the language.