Use List::Objects::WithUtils for IRC::Message::Object attribs

(There is a performance hit involved, but I want this for
IRC::Server::Pluggable)

	modified:   dist.ini
	modified:   lib/IRC/Message/Object.pm
optimize tags_as_string a bit

	modified:   lib/IRC/Message/Object.pm
Merge branch 'msgobjs-with-lowu'

* msgobjs-with-lowu:
  optimize tags_as_string a bit
  Use List::Objects::WithUtils for IRC::Message::Object attribs