Move the matching in the launcher to its own struct and make it so the
matches are unique and we don't end up with 2 or 3 matches for the same
program. Change the priorities so that they are bundled together with
the fuzzy matching score and thus very good keyword matches will beat
out very poor name matches.
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.
Cyril Levis