changed: now we do not use std::string and char* in the Winix API

everywhere we are using std::wstring and wchar_t*
         (std::string and char* is used only locally in some places
         especially when creating a path to OS file system etc.)
added:   to the special thread when winix closes:
         a write function for curl: FetchPageOnExitCurlCallback()
         without this function the curl library will print
         the page's content to the standart output
changed: TextStream<> class from core can make
         UTF8<->wide strings conversions
removed: from config: utf8 option
         now winix expects UTF8 from the user's input (html forms, url-es)
         and outputs strings in the UTF8 format




git-svn-id: svn://ttmath.org/publicrep/winix/trunk@965 e52654a7-88a9-db11-a3e9-0013d4bc506e

core/pluginmsg.h

@@ -268,8 +268,8 @@ namespace Winix
 #define WINIX_BASE_URL_REDIRECT				31030
 
 // raw POST parameters
-// in p1 there is a pointer to std::string meaning a parameter's name
-// in p2 there is a pointer to std::string value
+// in p1 there is a pointer to std::wstring meaning a parameter's name
+// in p2 there is a pointer to std::wstring value
 // this is sent only from PostParser
 // PostMultiParser (multipart/form-data html forms) doesn't send this messsage
 // there is no a session set (session pointer is null)