WIP: remove the old database abstraction layer

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

while here:
- remove: TextStream, SLog, TexTextStream

winixd/plugins/mailregister/registermail_info.cpp

@@ -5,7 +5,7 @@
  */
 
 /*
- * Copyright (c) 2016, Tomasz Sowa
+ * Copyright (c) 2016-2024, Tomasz Sowa
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -35,6 +35,9 @@
 #include "registermail_info.h"
 
 
+namespace Winix::MailRegister
+{
+
 
 bool RegisterMailInfo::HasListId(int id)
 {
@@ -42,5 +45,8 @@ bool RegisterMailInfo::HasListId(int id)
 }
 
 
+}
+
+