It is now possible to specify the host and port the SSH server listens
to using CLI arguments. Also improved host key naming and some inline
strings within the CLI version menu.
* Made constructed `App` instances use CLI args for `frame_rate` and
`tick_rate`
* Moved lazy constants from `LazyLock` to `lazy_static!`
* Slightly restructure SSH config initialization
* Also apply rustfmt formatting to some files
Makes controls usable by taking SSH keystroke data (encoded in the xterm
format) and converting them to crossterm `KeyCode`s / `KeyEvent`s and
sending them to the `Tui`.
Also adds support for suspension of the `Tui` over the SSH connection.
Some minor refactoring was also done.