kopete Off-The-Record messaging plugin

This is a kopete plugin which implements Off-the-Record (OTR) Messaging. OTR allows you to have private conversations over IM by providing:

- Encryption: No one else can read your instant messages.

- Authentication: You are assured the correspondent is who you think it is.

- Deniability: The messages you send do _not_ have digital signatures that are checkable by a third party.  Anyone can forge messages after a conversation to make them look l
ike they came from you. However, _during_ a conversation, your correspondent is assured the messages he sees are authentic and unmodified.

- Perfect forward secrecy: If you lose control of your private keys, no previous conversation is compromised.