Fix MessageHandler::handleNoticeMessage()
MessageView: take ownership of the channel object

Ensures that the channel object gets correctly destructed
when closing a channel view.
Added quassel submodule
WIP: quassel support
WIP: adjusting to the latest quassel source..
Able to connect again..
Receive NAMES
Fake immediate PING/PONG response
WIP: Request backlog...
WIP: server & error messages