Command-line interface

In this tutorial you'll get familiar with:

• Building Rust code for the wasm32-wasi target
• Running applications on the command-line using wasmtime
• Re-using existing crates in a WASM application
• wasmtime's capability-based system

We start with a command-line tool that takes an image and a filter name as input. It applies the given filter to the image and produces an output.png.