Make search work over css variables and mixins.

      docs.each do |cls|

        list << class_node(cls)

        [:members, :statics].each do |group|

          [:cfg, :property, :method, :event].each do |type|

          cls[group].each_key do |type|

            cls.members(type, group).each do |m|

              # skip inherited items and constructors

              if m[:owner] == cls.full_name && m[:name] != cls.short_name