array_to_mode() properly supports IRC::Mode::Set

	modified:   lib/IRC/Mode/Single.pm
	modified:   lib/IRC/Toolkit/Colors.pm
	modified:   lib/IRC/Toolkit/Modes.pm
	modified:   t/02_util/isupport.t
	modified:   t/04_irc_modechange.t
Cleanups

	modified:   lib/IRC/Mode/Set.pm
	modified:   lib/IRC/Toolkit/Modes.pm
cleanups