Added UserData to cHTTPRequest.

Callbacks may store one pointer of per-request data in the cHTTPRequest object. The object doesn't touch this data (doesn't own it).

source/HTTPServer/HTTPMessage.cpp

@@ -55,7 +55,8 @@ void cHTTPMessage::AddHeader(const AString & a_Key, const AString & a_Value)
 // cHTTPRequest:
 
 cHTTPRequest::cHTTPRequest(void) :
-	super(mkRequest)
+	super(mkRequest),
+	m_UserData(NULL)
 {
 }