WIP: remove the old database abstraction layer

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

while here:
- remove: TextStream, SLog, TexTextStream

winixd/models/winixmodelconnector.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
@@ -48,7 +48,6 @@ WinixModelConnector::WinixModelConnector()
 	mounts = nullptr;
 	users = nullptr;
 	groups = nullptr;
-	slog = nullptr;
 	session = nullptr;
 	locale = nullptr;
 	session_manager = nullptr;
@@ -99,12 +98,6 @@ Groups * WinixModelConnector::get_winix_groups()
 }
 
 
-SLog * WinixModelConnector::get_winix_session_logger()
-{
-	return slog;
-}
-
-
 Session * WinixModelConnector::get_winix_session()
 {
 	return session;
@@ -182,12 +175,6 @@ const Groups * WinixModelConnector::get_winix_groups() const
 }
 
 
-const SLog * WinixModelConnector::get_winix_session_logger() const
-{
-	return slog;
-}
-
-
 const Session * WinixModelConnector::get_winix_session() const
 {
 	return session;
@@ -261,12 +248,6 @@ void WinixModelConnector::set_winix_groups(Groups * groups)
 }
 
 
-void WinixModelConnector::set_winix_session_logger(SLog * slog)
-{
-	this->slog = slog;
-}
-
-
 void WinixModelConnector::set_winix_session(Session * session)
 {
 	this->session = session;