Adds Mods.Common usings where necessary.

OpenRA.Mods.RA/Scripting/Global/MapGlobal.cs

@@ -11,6 +11,7 @@
 using System;
 using System.Linq;
 using Eluant;
+using OpenRA.Mods.Common;
 using OpenRA.Scripting;
 
 namespace OpenRA.Mods.RA.Scripting

OpenRA.Mods.RA/Scripting/LuaScript.cs

@@ -10,6 +10,7 @@
 
 using System;
 using OpenRA.Graphics;
+using OpenRA.Mods.Common;
 using OpenRA.Scripting;
 using OpenRA.Traits;