Your agents can track clans and players

An agent can now track more than the clan it was made for: a rival clan it is asked to watch, the other clans of a family, or a player worth following. Its console has a Tracking page for it, and an agent can also do it itself with elixir_track_clan and elixir_track_player. Its players are watched, never treated as the agent itself. The clan it acts for can be changed to another of its clans, and it keeps at least one. Everything your agents track shares your recording slots: a player or clan counts once however many of you track it, so making agents never adds slots. Contract 7.1.0.