FEATURE: Add new site setting list type with name and values (#16045)

These changes include a bug fix because allow_any attribute of site
settings was completely ignored before.

lib/site_settings/type_supervisor.rb

@@ -164,6 +164,10 @@ class SiteSettings::TypeSupervisor
       end
     end
 
+    if type == :list
+      result[:allow_any] = @allow_any[name]
+    end
+
     result[:choices] = @choices[name] if @choices.has_key? name
     result[:list_type] = @list_type[name] if @list_type.has_key? name
     result[:textarea] = @textareas[name] if @textareas.has_key? name