WIP: remove the old database abstraction layer

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

while here:
- remove: TextStream, SLog, TexTextStream

winixd/core/logmanipulators.h

@@ -5,7 +5,7 @@
  */
 
 /* 
- * Copyright (c) 2011-2018, Tomasz Sowa
+ * Copyright (c) 2011-2024, Tomasz Sowa
  * All rights reserved.
  * 
  * Redistribution and use in source and binary forms, with or without
@@ -74,12 +74,6 @@ enum LogManipulators
 	 */
 	logendrequest,
 
-	/*
-	 * it would be better to the SLog to have its own manipulators
-	 */
-	loginfo,
-	logerror,
-	logwarning
 };