The _style is redundant, as the whole theme is a collection of styles.
Headers are not really regarded as headers, more as text. Highlight
makes more sense as highlighted.
This is an API breaking change.
The select/unselect icons of a CliMultiMenu will in nearly all cases be
changed together, therefore it makes sense to let the API be less
verbose for this case.
This is an API breaking change for CliMultiMenu