This is a migration of https://github.com/bitcoin-core/gui/pull/162 to this repo. It adds a network column to the Peers window, adds the network to the peer details, and renames two peers column headers from NodeId and Node/Service to Peer Id and Address. The initial version of the pull only changed gui code; however, the first commit now touches code in net.{h, cpp} and rpc/net.cpp. Please see the original pull for the review up to this point, including an ACK by hebasto.
