Revert "Require libotr 4.0.0 instead of the version it was compiled with"

This reverts commit 09a04ac975270a7433943b4113cbb220d4d16ed8.

It got rejected upstream (this is not our problem), and tbh I agree.
msn: update ABService ApplicationId to WLM 2012 to fix login

The previous ApplicationId was from WLM 2008 (8.5)
travis: Don't require signatures in dpkg-buildpackage

It started failing recently due to an update on their side.

And signing debs that are just going to be thrown away is pointless.
msn: Update ApplicationId again to one used by skype

Because why not
msn_buddy_ask: only ask to add if contact is in pending list

Previously it asked if they were in pending/reverse but not allow/block.
In theory that would fix inconsistent states. And in practice... nope.
msn: add 'allow' role if contact has neither block nor allow

This workarounds the problems of showing as offline to other contacts,
by sending ADL with role 3 (FL+AL) instead of just 1 (FL, no AL or BL)
twitter: start stream from last tweet on connect/reconnect