Implemented IEquatable<T> to speed up equality comparisons.

Actor, CPos, CVec, WAngle, WPos, WRange, WRot and WVec structs now implement IEquatable<T> which means unboxing/casting costs can be eliminated.

Also simplified the ToString method by concatenating components directly rather than using a format string since the overhead is a bit high for simple cases like this.

OpenRA.Game/Actor.cs

@@ -21,7 +21,7 @@ using OpenRA.Traits;
 
 namespace OpenRA
 {
-	public class Actor : IScriptBindable, IScriptNotifyBind, ILuaTableBinding, ILuaEqualityBinding, ILuaToStringBinding
+	public class Actor : IScriptBindable, IScriptNotifyBind, ILuaTableBinding, ILuaEqualityBinding, ILuaToStringBinding, IEquatable<Actor>
 	{
 		public readonly ActorInfo Info;
 
@@ -158,7 +158,12 @@ namespace OpenRA
 		public override bool Equals(object obj)
 		{
 			var o = obj as Actor;
-			return o != null && o.ActorID == ActorID;
+			return o != null && Equals(o);
+		}
+
+		public bool Equals(Actor other)
+		{
+			return ActorID == other.ActorID;
 		}
 
 		public override string ToString()