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.Mods.RA/World/SmudgeLayer.cs

@@ -83,7 +83,7 @@ namespace OpenRA.Mods.RA
 			{
 				if (!cliprect.Contains(kv.Key.X,kv.Key.Y))
 					continue;
-				if (localPlayer != null && !localPlayer.Shroud.IsExplored(kv.Key))
+				if (localPlayer != null && !world.RenderedShroud.IsExplored(kv.Key))
 					continue;
 
 				smudgeSprites[kv.Value.type- 1][kv.Value.index].DrawAt(wr, kv.Key.ToPPos().ToFloat2(), "terrain");