WIP: remove the old database abstraction layer

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

while here:
- remove: TextStream, SLog, TexTextStream

winixd/models/winixmodel.cpp

@@ -5,7 +5,7 @@
  */
 
 /*
- * Copyright (c) 2021, Tomasz Sowa
+ * Copyright (c) 2021-2024, Tomasz Sowa
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -131,19 +131,6 @@ Groups * WinixModel::get_groups()
 }
 
 
-SLog * WinixModel::get_session_logger()
-{
-	WinixModelConnector * connector = get_winix_model_connector();
-
-	if( connector )
-	{
-		return connector->get_winix_session_logger();
-	}
-
-	return nullptr;
-}
-
-
 Session * WinixModel::get_session()
 {
 	WinixModelConnector * connector = get_winix_model_connector();
@@ -314,19 +301,6 @@ const Groups * WinixModel::get_groups() const
 }
 
 
-const SLog * WinixModel::get_session_logger() const
-{
-	const WinixModelConnector * connector = get_winix_model_connector();
-
-	if( connector )
-	{
-		return connector->get_winix_session_logger();
-	}
-
-	return nullptr;
-}
-
-
 const Session * WinixModel::get_session() const
 {
 	const WinixModelConnector * connector = get_winix_model_connector();