Leveraging Trait Objects

Making a multi-call binary is a neat way of sharing code between a number of small programs. Perhaps the most famous example is [Busybox](https://busybox.net) but there are others such as Dropbear (an ssh client and server) or BeastieBox. I once even wrote a multi-call shell script, which sourced a different file full of functions depending on the name it was called as. Today's project is inspired heavily by BusyBox but is written in Rust and has a somewhat more limited scope.