Fully interactive UI for caracter sheets

[peterkos]

Ideally, character sheets could be edited "inline" using something like tui, but this seems pretty complicated to implement.

Would also have to use crossterm but termion is probably fine w/ a refactor later.

References:

• tui-rs source
• gitui main.rs

[peterkos]

On the #tui branch

Pushing this out farther b/c this is painful to implement... even with a terminal wrapper crate we still need a custom input handling mechanism. My other project rolex is a little farther along with its input and its just messy :(

It might be easiest to hack together a similar "two-pane" implementation (i.e., character table on right, input on left, or vice-versa) using clear_last_lines and our print_table() func for now.