Removed unused function; Added 'configure' method to plugin primitive mixin to allow dynamically changing plugin parameters; Better 'date' filter that exports xtiger.util.date conversion methods (primarily for AXEL-FORMS 'date' sub-type of 'input' plugin), note that this filter could be splitted between a date device and a filter in the future; Typo in error message; Defensive test in 'photo' lens dialog window opening.