Add cargo-like "mode line" at the bottom of terminal output

[cassaundra]

Using ANSI styling, pin a list of all currently running tasks at the bottom of terminal outputs for those that support it.

Depends on #22, and best completed after #25.

[epage]

Cargo's mode line is very primitive to be as compatible as possible, to a paranoid level. You can likely use something like https://crates.io/crates/superconsole

[cassaundra]

Good to know. crossterm is already in the dependency tree, so I plan on implementing manually via that before resorting to a batteries included package. Will have to figure out some introspection of the current terminal's capabilities, in addition to checking whether or not output is currently being redirected. I'm assuming anstream would be a good fit for that?

[epage]

anstream can tell you whether coloring is supported. IsTerminal trait can tell you whether its interactive (which intersects with the question of color). I have not looked into how to auto detect whether more TUI-like capabilities are supported (yet).