* [NOD-1124] Rename Peer to Connection (because Peer is a business logic term)
* [NOD-1124] Implement Close for Router.
* [NOD-1124] Add SetPeerDisconnectedHandler.
* [NOD-1124] Remove mentions of "peer" from the netadapter package.
* [NOD-1124] Handle errors/stopping in netadapter.
* [NOD-1124] Remove netadapter.Connection.
* [NOD-1124] Add startSendLoop.
* [NOD-1124] Implement network IDs.
* [NOD-1124] Implement a map between IDs and routes.
* [NOD-1124] Implement Broadcast.
* [NOD-1124] Fix rename error.
* [NOD-1124] Fix copy+paste error.
* [NOD-1124] Change the type of NetAdapter.stop to uint32.
* [NOD-1124] If NetAdapter is stopped more than once, return an error.
* [NOD-1124] Add an error case to RouteInputMessage.
* [NOD-1124] Rename CreateID to NewID.
* [NOD-1124] Spawn from outside startReceiveLoop and startSendLoop.
* [NOD-1124] Fix a comment.
* [NOD-1124] Replace break with for condition.
* [NOD-1124] Don't disconnect from disconnected peers.
* [NOD-1124] Fix a for condition.
* [NOD-1124] Handle an error.
