beef up OpenRA.FileFormats.Set a little; use it in CncMenuPaletteEffect rather than making new List<string> every frame

OpenRA.FileFormats/Primitives/Set.cs

@@ -12,7 +12,7 @@ using System;
 using System.Collections;
 using System.Collections.Generic;
 
-namespace OpenRA.Collections
+namespace OpenRA.FileFormats
 {
 	public class Set<T> : IEnumerable<T>
 	{
@@ -44,5 +44,13 @@ namespace OpenRA.Collections
 		{
 			return GetEnumerator();
 		}
+
+		public bool Contains( T obj ) { return data.ContainsKey(obj); }
+
+		public Set( params T[] ts )
+		{
+			foreach( var t in ts )
+				Add(t);
+		}
 	}
 }

OpenRA.Game/World.cs

@@ -11,7 +11,6 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
-using OpenRA.Collections;
 using OpenRA.Effects;
 using OpenRA.FileFormats;
 using OpenRA.Network;

OpenRA.Mods.Cnc/CncMenuPaletteEffect.cs

@@ -61,12 +61,13 @@ namespace OpenRA.Mods.Cnc
 			}
 		}
 
+		static Set<string> excludePalettes = new Set<string>("cursor", "chrome", "colorpicker", "shroud", "fog");
+
 		public void AdjustPalette(Dictionary<string,Palette> palettes)
 		{
 			if (to == EffectType.None && remainingFrames == 0)
 				return;
 
-			var excludePalettes = new List<string>(){"cursor", "chrome", "colorpicker", "shroud", "fog"};
 			foreach (var pal in palettes)
 			{
 				if (excludePalettes.Contains(pal.Key))