Add Lua API export in EmmyLua syntax.

OpenRA.Game/Scripting/ScriptMemberWrapper.cs

@@ -14,6 +14,7 @@ using System.Collections.Generic;
 using System.Linq;
 using System.Reflection;
 using Eluant;
+using OpenRA.Traits;
 
 namespace OpenRA.Scripting
 {
@@ -140,5 +141,18 @@ namespace OpenRA.Scripting
 				return false;
 			});
 		}
+
+		public static string[] RequiredTraitNames(Type t)
+		{
+			// Returns the inner types of all the Requires<T> interfaces on this type
+			var types = t.GetInterfaces()
+				.Where(i => i.IsGenericType && i.GetGenericTypeDefinition() == typeof(Requires<>));
+
+			// Remove the namespace and the trailing "Info"
+			return types.SelectMany(i => i.GetGenericArguments())
+				.Select(g => g.Name.Split(new[] { '.' }, StringSplitOptions.RemoveEmptyEntries).LastOrDefault())
+				.Select(s => s.EndsWith("Info") ? s.Remove(s.Length - 4, 4) : s)
+				.ToArray();
+		}
 	}
 }