libtorc-core: Replace TorcRPCRequest::HasParent with
TorcRPCRequest::IsNotification
libtorc-core: Minor TorcRPCRequest change
libtorc-core: Add missing header in TorcRPCRequest
libtorc-core: Start notifying when peers (dis)connect in
TorcNetworkedContext
libtorc-core: Start handling client requests in TorcNetworkedContext

- and move more towards regular signals/slots
libtorc-media: Add TorcMediaSourcePeer