[Feature Request] Add ability to select tasks and move view with same keys

[rdg922]

Hi, I really like how vim keybindings allow users to do a lot while their fingers stay near homerow and I've been attempting to get something similar with Masterplan. I currently have move set to "hjlk" being left, down, up, right but I also want to be able to select tasks with the same keys, possibly by using a modifier. As the project currently stands I do not believe that is possible with the current button remapping and I think it would be a worthwhile.

Thank you for this project!

[rdg922]

I've been getting around really well with hjkl for task moving though so on second thought.