WIP: remove the old database abstraction layer

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

while here:
- remove: TextStream, SLog, TexTextStream

winixd/core/winixrequest.cpp

@@ -5,7 +5,7 @@
  */
 
 /*
- * Copyright (c) 2018, Tomasz Sowa
+ * Copyright (c) 2018-2024, Tomasz Sowa
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -55,7 +55,6 @@ WinixRequest::~WinixRequest()
 void WinixRequest::set_cur(Cur * cur)
 {
 	this->cur = cur;
-	slog.SetCur(cur);
 }
 
 
@@ -68,7 +67,6 @@ void WinixRequest::set_session_manager(SessionManager * session_manager)
 void WinixRequest::set_locale(Locale * locale)
 {
 	this->locale = locale;
-	slog.SetLocale(locale);
 }