WIP: remove the old database abstraction layer

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

while here:
- remove: TextStream, SLog, TexTextStream

winixd/plugins/mailregister/funregistermail_showusers.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
@@ -79,9 +79,7 @@ void FunRegisterMailShowUsers::MakePost()
 
 void FunRegisterMailShowUsers::MakeGet()
 {
-	pmdb->GetUsers(pinfo->mail_list);
-
-
+	pmdb->GetUsers(model_connector, pinfo->mail_list);
 }