Introducing per-player shrouds.

- Each player has their own shroud and their visibility does not extend outside of the shroud. 
- Units and buildings can no longer target other units outside of their visibility. Buildings can still be targetted if they have been explored.
- GPS will provide visibility in the fog-of-war.
- Spies that infiltrate radar domes will gain their victim's exploration and reset it on all clients (if the victim does not have GPS)

OpenRA.Game/Traits/World/ResourceLayer.cs

@@ -40,7 +40,7 @@ namespace OpenRA.Traits
 			for (int x = clip.Left; x < clip.Right; x++)
 				for (int y = clip.Top; y < clip.Bottom; y++)
 				{
-					if (!world.LocalShroud.IsExplored(new CPos(x, y)))
+					if (!world.RenderedShroud.IsExplored(new CPos(x, y)))
 						continue;
 
 					var c = content[x, y];