Add optional vim controls

[Hexman768]

Description

While I was using the editor when testing the settings form, I realized that since we don't have automatic bracket closing, vim controls would be really nice to have as an optional setting.

I highly doubt that I'll be able to get to this soon, but either way it seems like it would be a cool feature to have.

[Hexman768]

This behavior would likely have to be created in a plugin. This is fine, however this does create the need for a plugin infrastructure.