MVC Configuration:
- Comments added next to Constants definitions in frontal controller index.php
- As a matter of readibility, files involved in using constants annotated in comments.
English translation of existing comments and add some more within:
	- .htaccess
	- lib/Kernel.php
	- lib/Router.php
	- app/controllers/Controller.php

Rename files Routeur.php -> Router.php and Controleur.php -> Controller.php

For security concerns, add temporary array securedRequest[] in:
	- Kernel::secureRequestParameters(array $request)