Actions and replace

Replace module does not like replacing content in actions. General improvements to the way NexBot handles actions would be good e.g. replacing flag

> 17:09 <+flabby> I don't think he likes actions
> 17:09  \* flabby hello
> 17:09 <+flabby> s/hello/goodbye
> 17:09 <+NexBot> I don't think he likes actions
