Added support for prefix text before the marshaled argument is passed to the wrapped native function.

src/Generator/Generators/CLI/CLIMarshal.cs

@@ -236,6 +236,7 @@ namespace Cxxi.Generators.CLI
             SupportBefore = new TextGenerator();
             SupportAfter = new TextGenerator();
             Return = new TextGenerator();
+            ArgumentPrefix = new TextGenerator();
         }
 
         public bool VisitTagType(TagType tag, TypeQualifiers quals)

src/Generator/Generators/CLI/CLISourcesTemplate.cs

@@ -312,6 +312,9 @@ namespace Cxxi.Generators.CLI
 
                     if (!string.IsNullOrWhiteSpace(marshal.SupportAfter))
                         WriteLine(marshal.SupportAfter);
+
+                    var argText = marshal.ArgumentPrefix + argName;
+                    @params.Add(new ParamMarshal { Name = argText, Param = param });
                 }
             }