Keyword matches are always at a lower priority than name matches. It
would probably make sense to extend this into something smarter where
very good matches of keywords beat really poor matches of name.
1. Implement new layout API, replacing previous hard-coded layout.
2. Make the widgets (previously modules) configurable.
3. Split some widgets into smaller modules.
4. Configuration file (reluctantly JSON at time of writing).
5. More correct damage handling, copying damage to next buffer.