Make IrcConnection::network actually accessible from QML
Fix build on Qt 4
Add IrcBuffer::receiveMessage() [slot]
Add IrcBufferModel::add(IrcBuffer*) overload
IrcBufferModel: use IrcBuffer::isChannel() & toChannel()
Fix namespaced build
Enable namespace build test
Force moc code into namespace to fix namespaced Qt 4 build as well
irc.h: cleanup Q_ENUMS(BufferType)
Make Irc::version() & toString() return QString for QML compat
IrcSender IrcMessage::sender() -> QString IrcMessage::prefix()

This is the first step towards QML compatibility. The prefix parts
(name, user, host) will be made available in a separate commit.
Add QML compatible IrcMessage::sender(Name|User|Host)
WIP: QtQuick based example