WIP: remove the old database abstraction layer

remove such classes:
- DbBase
- DbConn
- DbTextStream
- Db

while here:
- remove: TextStream, SLog, TexTextStream

winixd/notify/notifythread.cpp

@@ -5,7 +5,7 @@
  */
 
 /* 
- * Copyright (c) 2008-2022, Tomasz Sowa
+ * Copyright (c) 2008-2024, Tomasz Sowa
  * All rights reserved.
  * 
  * Redistribution and use in source and binary forms, with or without
@@ -33,6 +33,7 @@
  */
 
 #include "notifythread.h"
+#include "core/misc.h"
 
 
 namespace Winix
@@ -210,7 +211,7 @@ bool queue_end;
 // second thread
 void NotifyThread::SendMail()
 {
-	notify_stream.Clear();
+	notify_stream.clear();
 	
 	size_t lang_id = TemplatesNotifyFunctions::notify_user_msg.lang;
 	size_t template_index = TemplatesNotifyFunctions::notify_msg.template_index;
@@ -250,7 +251,9 @@ void NotifyThread::SendMail()
 		generator.CanUseCache(false);
 		generator.Generate(notify_stream);
 
-		SendMail(TemplatesNotifyFunctions::notify_user_msg.email, notify_stream.Str());
+		notify_stream.to_str(msg_str);
+		SendMail(TemplatesNotifyFunctions::notify_user_msg.email, msg_str);
+		msg_str.clear();
 	}
 }