Add two multiplayer scenarios
This is more a reminder than a bug report:
SirVer and I talked about two multiplayer scenarios that should be shipped with Build16:
* "Island hopping" - the goal is to be the first to reach the end island - each player starts on an island and has to expand in one direction, to reach the other side of the island - once (s)he reaches the other side, (s)he hops to the next island, which means: a new headquarters will be generated on the next island. This goes on and on until the first player reaches the end island.
* "Warehouse exchange" - in an x shaped map (there should be one in trunk) the two players starting on one line of the x need to exchange a specific amount of a specific ware via warehouses build at touching borders - as the other two have the same goal, "having touching borders" will surely be a hard goal.