WIP: remove the old database abstraction layer

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

while here:
- remove: TextStream, SLog, TexTextStream

winixd/core/dirs.h

@@ -5,7 +5,7 @@
  */
 
 /* 
- * Copyright (c) 2008-2021, Tomasz Sowa
+ * Copyright (c) 2008-2024, Tomasz Sowa
  * All rights reserved.
  * 
  * Redistribution and use in source and binary forms, with or without
@@ -40,7 +40,6 @@
 #include <map>
 #include <string>
 #include "dircontainer.h"
-#include "db/db.h"
 #include "request.h"
 #include "models/item.h"
 #include "winixmodeldeprecated.h"
@@ -65,7 +64,6 @@ public:
 	void ReadDirs();
 
 	void SetCur(Cur * pcur);
-	void SetDb(Db * pdb);
 	void SetNotify(Notify * pnotify);
 
 	void set_dependency(WinixModelDeprecated * winix_model);
@@ -130,7 +128,6 @@ public:
 private:
 
 	Cur    * cur;
-	Db     * db;
 	Notify * notify;
 
 	DirContainer dir_tab;