Binding groups

[willmcgugan]

• Adds Binding "groups", which allow you to cluster bindings with a single description. This can save space where the key is self explanatory.

For instance, you may have cursor keys like this:

↑ up  ↓ down  ← left  → right

This update would allow you to render them like so:

↑ ↓ ← → move cursor

• Optimized textual.fuzzy quite dramatically

@darrenburns You may be interested in the faster fuzzy search. IIRC you use it in Posting?