WIP: remove the old database abstraction layer

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

while here:
- remove: TextStream, SLog, TexTextStream

winixd/functions/functionbase.h

@@ -5,7 +5,7 @@
  */
 
 /*
- * Copyright (c) 2010-2023, Tomasz Sowa
+ * Copyright (c) 2010-2024, Tomasz Sowa
  * All rights reserved.
  * 
  * Redistribution and use in source and binary forms, with or without
@@ -37,7 +37,6 @@
 
 #include <string>
 #include <vector>
-#include "db/db.h"
 #include "core/request.h"
 #include "core/config.h"
 #include "core/synchro.h"
@@ -160,7 +159,6 @@ public:
 
 	//void SetConfig(Config * pconfig);
 	//void SetCur(Cur * pcur);
-	void SetDb(Db * pdb);
 	//void SetSystem(System * psystem);
 	void SetFunctions(Functions * pfunctions);
 	void SetTemplates(Templates * ptemplates);
@@ -172,7 +170,6 @@ public:
 protected:
 
 	//Config    * config;
-	Db        * db; // depracated
 	//System    * system;
 	Functions * functions;
 	Templates * templates;