Clean-up and XML handling enhancement:

- XML helper functions always return objects by winstd::com_obj or winstd::bstr reference now to ensure proper release by caller
- get_element_value()/put_element_value() can optionally return reference to the XML object if required
- WinStd macros to simplify dplhandle<> and handle<> inherited classes reused by non-copyable classes

lib/EAPBase/include/Module.h

@@ -60,6 +60,8 @@ namespace eap
 {
     class module
     {
+        WINSTD_NONCOPYABLE(module)
+
     public:
         ///
         /// Constructs a module for the given EAP type
@@ -556,6 +558,8 @@ namespace eap
 
     class peer : public module
     {
+        WINSTD_NONCOPYABLE(peer)
+
     public:
         ///
         /// Constructs a EAP peer module for the given EAP type