Simplify names, remove unused usings, remove redundant casts.

OpenRA.Game/Support/LaunchArguments.cs

@@ -29,7 +29,7 @@ namespace OpenRA
 			if (args == null)
 				return;
 
-			foreach (var f in this.GetType().GetFields())
+			foreach (var f in GetType().GetFields())
 				if (args.Contains("Launch" + "." + f.Name))
 					FieldLoader.LoadField(this, f.Name, args.GetValue("Launch" + "." + f.Name, ""));
 		}

OpenRA.Game/Support/PerfHistory.cs

@@ -8,9 +8,6 @@
  */
 #endregion
 
-using System;
-using System.Collections.Generic;
-using System.Diagnostics;
 using System.Drawing;
 using OpenRA.Primitives;
 

OpenRA.Game/Support/PerfItem.cs

@@ -8,11 +8,8 @@
  */
 #endregion
 
-using System;
 using System.Collections.Generic;
-using System.Diagnostics;
 using System.Drawing;
-using OpenRA.Primitives;
 
 namespace OpenRA.Support
 {

OpenRA.Game/Support/PerfSample.cs

@@ -9,10 +9,7 @@
 #endregion
 
 using System;
-using System.Collections.Generic;
 using System.Diagnostics;
-using System.Drawing;
-using OpenRA.Primitives;
 
 namespace OpenRA.Support
 {