TUI mode

[corysabol]

It might be nice to have a terminal UI mode for the tool. It would look a lot like the Ranger TUI seen below:

This mode could do the following:

• List groups in the left most column
• List selected group entries in the middle column
• List the contents of the entry in the largest right most column

This mode would allow for some quality of life features:

• Reduced disk I/O since the DB can be operated up on in memory for multiple actions
• Reduced password entry since the database can be edited in memory and the password can be cached temporarily
• Easier to navigate the DB since the user can visually see the layout, no more needing to know exactly what to query for from the CLI

This of course might be a pretty big undertaking since I will need to have a stable ktwo core implementation to support cli interactions as well as to support TUI interactions. I would also need to use some sort of curses like library, perhaps blessed, although it seems unmaintained.