Wordstar/Joe Style Editing

Adds wordstar-style keybindings a'la the command line editor joe, including persistent block manipulation, separate from selection.

This aims to be a complete joe mode for Atom. Because I'd rather write code than learn new keybindings. 😉Plus, I'm too used to being able to mark a block of text and operate on it without having it go away any time I move the cursor.

Known Bugs

If you move a block and then undo the move, the display of your buffer will be corrupted.