WIP: remove the old database abstraction layer

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

while here:
- remove: TextStream, SLog, TexTextStream

winixd/plugins/export/funexport.h

@@ -5,7 +5,7 @@
  */
 
 /* 
- * Copyright (c) 2012-2021, Tomasz Sowa
+ * Copyright (c) 2012-2024, Tomasz Sowa
  * All rights reserved.
  * 
  * Redistribution and use in source and binary forms, with or without
@@ -36,7 +36,6 @@
 #define headerfile_winix_plugins_export_funexport
 
 #include "functions/functionbase.h"
-#include "db/db.h"
 #include "exportinfo.h"
 
 namespace Winix