add Platform.class to fixe default platform

[ErickLesech]

j'ai ajouté une class PLatform pour corriger la selection de la plateforme OpenCL par defaut

[jeancharles-roger]

Hi Erick,

Thank you for the pull request.

Could you avoid French in comments and code (function or variable names) in the code ?
I agree that not much non French speaker reads MatrixStudio code 😂, but it's an habit in most open source project to only use English for accessibility and it's good English practice 😉.

Kind regards.

[jeancharles-roger]

Thank you for the translation