WIP: remove the old database abstraction layer

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

while here:
- remove: TextStream, SLog, TexTextStream

winixd/functions/functionbase.cpp

@@ -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
@@ -33,6 +33,7 @@
  */
  
 #include "functionbase.h"
+#include "core/misc.h"
 #include "functions.h"
 #include "templates/templates.h"
 
@@ -60,7 +61,6 @@ FunctionBase::FunctionBase()
 	fun.id         = -1;
 	fun.type       = Item::file;
 
-	db = nullptr;
 	functions = nullptr;
 	templates = nullptr;
 }
@@ -85,12 +85,6 @@ FunctionBase::~FunctionBase()
 
 
 
-void FunctionBase::SetDb(Db * pdb)
-{
-	db = pdb;
-}
-
-
 //void FunctionBase::SetSystem(System * psystem)
 //{
 //	system = psystem;