Use class instead of id for controlbox-panes element
More UI improvements.

Don't show encrypted messages when we don't have an encrypted session set up on
our side (show error message instead).
Show many more info messages to inform user of OTR status
User can now end an encrypted session.
Added a way to verify your buddies identity

(by enabling fingerprint comparisons)
Bugfix. Plaintext msgs sent after OTR termination weren't saved
Implement a check that the user's password is still the same

before trusting the decrypted private key, otherwise generate a new one.
Fix tests
Let the toolbar dropdown drop up instead.
Add support for Socialist's Millionaire Protocol authentication