Provide an helper method to get the overloads of a function.

src/Bridge/Namespace.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.Diagnostics;
+using System.Linq;
 
 namespace Cxxi
 {
@@ -222,6 +223,12 @@ namespace Cxxi
             return Enums.Find(e => e.ItemsByName.ContainsKey(name));
         }
 
+        public IList<Function> GetFunctionOverloads(Function function)
+        {
+            return Functions.Where(fn => fn.Name == function.Name)
+                .ToList();
+        }
+
         public bool HasDeclarations
         {
             get