Fix compatibility issue with old SupportFunctions.lua

Add multiplayer support by Jamie-Nyanchi

Fix Dam validation check for special map generation.

Let player decide if map tacks should be auto deleted.

Auto delete the map tack if the represented district or wonder or improvement is added to the given plot.

Fixed Dam placement check for the case where river's ID doesn't equal to its Index.

Further Dam placement logic fix. Now it should REALLY be pretty accurate... Credits to @ubereffect for testing all different scenarios tirelessly!

Solve for another dam placement validation case. It should be very accurate now.

Correct dam placement validation. Second attempt to support Linux.

Align with official update that resources will be removed by districts or wonders.