WIP: remove the old database abstraction layer

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

while here:
- remove: TextStream, SLog, TexTextStream

winixd/functions/privchanger.h

@@ -5,7 +5,7 @@
  */
 
 /* 
- * Copyright (c) 2010-2021, Tomasz Sowa
+ * Copyright (c) 2010-2024, Tomasz Sowa
  * All rights reserved.
  * 
  * Redistribution and use in source and binary forms, with or without
@@ -36,9 +36,7 @@
 #define headerfile_winix_functions_privchanger
 
 #include "core/winixmodeldeprecated.h"
-#include "core/request.h"
 #include "core/system.h"
-#include "db/db.h"
 
 
 namespace Winix
@@ -54,13 +52,11 @@ public:
 
 	void SetCur(Cur * pcur);
 	void SetSystem(System * psystem);
-	void SetDb(Db * pdb);
 
 private:
 
 	Cur     * cur;
 	System  * system;
-	Db      * db;
 
 	long user_id_file, group_id_file, user_id_dir, group_id_dir;
 	int priv_file, priv_dir;