Fixed CTCP Action Spliting

Fixed CTCP Action Spliting

Previously /me would truncate if it was over the 512 character limit,
forming a malformed action as the last \01 character is cut off. Now the
CTCP Action should autosplit the same way that overflow on normal
messages does. Additionally the characters !? were added to the
splittable characters list, bringing the new list to " ,.-!?"