Metal names conflict with models

Hello,

By default, the metals are named only with their name.
Because of that, there's a possible conflict if we have a metal using the same name than a model.
If we have a metal "Example" and a model with the same name, we won't be able to call the model Example inside our metal because of this conflict name.

My suggestion would be to append "_metal" to the filename and "Metal" to the classname.