Add interactive UI mode, cf. vim-taskwarrior

[linuxcaffe]

This is a gigantic feature request, but I think it would be awesome if (something like) vim-ledger were to behave something like vim-taskwarrior.

https://github.com/farseer90718/vim-taskwarrior

Now it's true that taskwarrior is a task manager, and ledger is an accounting system, but they both have a similar approach with text-files and a rich command-set. Have a look, and perhaps you'll see what I mean.

[alerque]

I agree taskwarrior is cool, but I'm not sure how to bring that kind of interactive UI to this plugin ... or even entirely convinced that it should be.

Have you seen @rcaputo's vim-ledger_x?