Log Message:
Update to version 3.0.0

>From Jason White, via PR pkg/32452

Changes:

- Support for OTR protocol version 2; will still interoperate with
  version 1 clients (though with a warning to the user), fixes
  identity-binding flaw:
   http://www.cypherpunks.ca/otr/Protocol-v2-3.0.0.html

- The OTR button now has a right-click context menu with some useful
  options.

- The OTR button now has icons in addition to text to indicate what
  state a conversation is in.

- Most popups have been changed to inline messages in the conversation
  window.