Added CodeGenerator.AccessIdentifier instance method.

src/Generator/Generators/CodeGenerator.cs

@@ -106,6 +106,11 @@ namespace CppSharp.Generators
 
         public virtual string GeneratedIdentifier(string id) => Generator.GeneratedIdentifier(id);
 
+        public virtual string AccessIdentifier(AccessSpecifier accessSpecifier)
+        {
+            return Helpers.GetAccess(accessSpecifier);
+        }
+
         #endregion
 
         #region Comment generation