Fixed warnings, unused code and typos.

Including fix  _SCallback for 3 params, triggred mode correct call for .cast back and .cast target.
Remove outdated code for support old 19421 (and ranks) implementation in client data.

src/game/Level0.cpp

@@ -49,7 +49,7 @@ bool ChatHandler::HandleHelpCommand(const char* args)
     return true;
 }
 
-bool ChatHandler::HandleCommandsCommand(const char* args)
+bool ChatHandler::HandleCommandsCommand(const char* /*args*/)
 {
     ShowHelpForCommand(getCommandTable(), "");
     return true;