Customizable key bindings

[nitnelave]

For users with a non-standard keyboard (e.g. dvorak), the default vim key bindings are not great.

It would be awesome to be able to remap them, ideally in a config file.

Ideas:

• Either as letter-to-letter, e.g. "remap t j" makes "t" go down (like vim nnoremap)
• Or as letter to command name, e.g. "map t moveDown": overwrites the current (if any) shortcut for "t" to do the action "moveDown". There would be a default mapping for "j" to "moveDown".