Ruidmentary group searching in place.
Mark search results that don't match as found if their parent group is
also found.
Move the search string tester into its own method.
When an option matches, mark its parent group as matched as well.
Change the name of the group search option.
Groups that have search matches should also get highlights!
Merge branch 'master' into option-group-sarch
Merge branch 'option-group-sarch' into better_text_escaping