Remote sensors with player-specific lines

[narc0tiq]

(via https://forums.factorio.com/viewtopic.php?p=158391#p158391)

It would be good to have the ability to set the sensor line (in remote.call("EvoGUI", "update_remote_sensor", ...)) to a table keyed by player index or name. Then, when the sensor's get_line got called, we would return the appropriate value, or a default if no specific entry existed.