Reduce allocations in the main game loop.

- Cache the shroud projection even for flat maps to avoid allocating single element arrays.
- Avoid LINQ in shroud and map projection queries to avoid enumerator allocations.
- Avoid LINQ in calculation of sync values.
- Cache enumerables in ProductionQueue.
- Cache delegate in HackyAI.

OpenRA.Mods.Common/Traits/Player/MissionObjectives.cs

@@ -58,7 +58,16 @@ namespace OpenRA.Mods.Common.Traits
 		public ReadOnlyList<MissionObjective> Objectives;
 
 		[Sync]
-		public int ObjectivesHash { get { return Objectives.Aggregate(0, (code, objective) => code ^ Sync.Hash(objective.State)); } }
+		public int ObjectivesHash
+		{
+			get
+			{
+				var hash = 0;
+				foreach (var objective in objectives)
+					hash ^= Sync.Hash(objective.State);
+				return hash;
+			}
+		}
 
 		// This property is used as a flag in 'Cooperative' games to mark that the player has completed all his objectives.
 		// The player's WinState is only updated when his allies have all completed their objective as well.