Router, Uplink, and SimpleUplinkServer have been removed from the package.
Router is still available but now is an alias of the required dependency,
'nexus-router'.
Uplink and SimpleUplinkServer class definitions are not needed in the
class definitions. Uplink is now ducktype-checked in dev mode instead of
hardtype-checked.
Uplink has been moved to 'nexus-uplink-client' package.
SimpleUplinkServer has been renamed UplinkSimpleServer and moved to
'nexus-uplink-simple-server' package.