Validator now performs more checks, removed those checks from other code to make it simpler

Also updates some error messages and environment variables

Also adds a parameter type that wasnt taken into account in the function

Merge branch 'feature/ParameterSubsystem' of https://gitlab.fing.edu.uy/julieta.dubra/repp_backend into feature/ParameterSubsystem

Order was reversed, causing miscalculations