Refactor peer announcement and disable Twitter until it's ported
Unnecessary asserts are unnecessary.
Add PeerInfo to Source and SourceItem tooltips.
Properly init PeerInfo in its ctor
Fix updating the DiagnosticsDialog when new peers are set online
Add some useful data to the debugging tooltip
Fix all the style issues!
Add missing emit
Take sources offline if no peerinfos are available anymore
untested: Try to only take sources offline if user explicitly set xmpp-account offline not if connection failed
Don't rely on C++11 extensions