Utilise message classes to provide consistency

The mudlib should make use of message classes (see message efun manpage) to provide consistency. For example, all success messages could set their class to success and instead of the developer adding "%^BOLD%^GREEN%^Success [<object>]:%^RESET%^" to all their success messages, we could handle that (although we'll have to stip all the current ones out). This would ensure all success messages look the same and we (or the mud admins) can easily update it (making the change system wide immediately) later (neat use case would be translation).