Comment 228 for bug 296867

I've made most of the changes I wanted but haven't had time to test them yet. Use at own risk:

http://cgit.freedesktop.org/~smcv/telepathy-gabble/log/?h=untested-otr

Still to do:

* testing (in particular, send "&lt;" and "<a message that resembles HTML>"
  in both directions between Empathy and Pidgin, and check that neither is
  misinterpreted)

* review from someone who understands libotr

* Empathy: make sure OTR notifications are presented in a way that
  peers cannot fake. Because Empathy doesn't support HTML messages yet,
  distinctive formatting would be enough.

* string-only handling of fingerprints (emit strings to D-Bus,
  parse hex -> binary when asked to trust a fingerprint from D-Bus)

Nice to have, but not blockers:

* TPAW UI for the enable-otr boolean parameter (for now, early adopters
  can turn it on with mc-tool - but I think real UI *is* a blocker for
  switching the default to be enabled)

* Chan.I.Securable.{Encrypted,Verified} integration

* enable-opportunistic-otr boolean parameter, and UI for the same
  (it will end up looking very similar to enable-otr, but with different
  handling in im-channel*.c)