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 " ,.-!?"
Updated Encode to not run additional times.

Fixed the issue of the message being encoded twice unnessesarily on
actions that did not require splitting.
Merge pull request #84 from tecknojock/master

Fixed splitting of CTCP ACTION
Small optimization

No need to copy the list around.