Update dependencies/code to support building with current versions of Rust

[craSH]

This PR fixes up the code so it will build with today's versions of Rust and the dependencies needed.

• Updates all crates to their current versions - getopts was the only neccesary update to properly build with current versions of the Rust toolchain, all others are simply updated as a nice-to-have.
• Fix panic() string formatting to comply with current/new requirements, per https://doc.rust-lang.org/nightly/edition-guide/rust-2021/panic-macro-consistency.html
• Add the sample JSON input from the readme to the repository, so it's ready to use for testing.

Testing performed for this PR:

These changes both result in a clean and successful build using the current stable and nightly toolchains:

• stable-aarch64-unknown-linux-gnu / rustc 1.71.0 (8ede3aae2 2023-07-12)
• nightly-aarch64-unknown-linux-gnu / rustc 1.73.0-nightly (500647fd8 2023-07-27)