WIP: remove the old database abstraction layer

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

while here:
- remove: TextStream, SLog, TexTextStream

winixd/core/sessionmanager.cpp

@@ -5,7 +5,7 @@
  */
 
 /* 
- * Copyright (c) 2008-2022, Tomasz Sowa
+ * Copyright (c) 2008-2024, Tomasz Sowa
  * All rights reserved.
  * 
  * Redistribution and use in source and binary forms, with or without
@@ -35,6 +35,7 @@
 #include <sys/stat.h>
 #include <limits>
 #include "sessionmanager.h"
+#include "core/misc.h"
 #include "request.h"
 #include "log.h"
 #include "session.h"
@@ -713,7 +714,7 @@ char file_path[WINIX_OS_PATH_SIZE];
 		return;
 	}
 
-	if( !wide_to_utf8(config->session_file, file_path, WINIX_OS_PATH_SIZE) )
+	if( !pt::wide_to_utf8(config->session_file, (char*)file_path, WINIX_OS_PATH_SIZE) )
 		return;
 
 	std::ofstream file(file_path);