Convert "String *" to "String"

As a sideeffect of the group element definition, the parser will
convert a ptype of "const GLubyte *" with a group of "String" to
"String *", which is not the correct result. GLXmlParser will now
detect and fix this condition that affects the GetString function of
families.

Source/Converter/GLXmlParser.cs

@@ -359,6 +359,7 @@ namespace CHeaderToXML
                     FunctionParameterType(command.Element("proto"))
                         .Replace("const", String.Empty)
                         .Replace("struct", String.Empty)
+                        .Replace("String *", "String")
                         .Trim()));
 
             foreach (var parameter in command.Elements("param"))