company--capf-data: Check that the cdr is cons, not data itself
company-capf common-part: look up font-lock-face

Because completion-pcm--hilit-commonality uses it.
company-capf: cache the capf data

The annotation command can be called a lot of times. At least in theory.
common-part: rename to `match' and document
company-continue-commands: change the default value
Bump the version