Bring back fog of war on map.

[dogmatic 7]

For pvp servers anyway I believe the fog of war on the map hiding all islands unless you've sailed there should be brought back from season 1.

This is pvp, if some random company sinks my boat i shouldn't be able to open my map and find their island in a tile I've never been to. 

Also makes exploring and finding an enemies island a lot more fun and exciting. Having to interact and talk to other companies if you want to find where someone is.