Improve management of template parameters
Template parameters are added to template in following places:
- lemonldap-ng-portal/lib/Lemonldap/NG/Portal/Main/Run.pm, sub tplParams
- lemonldap-ng-portal/lib/Lemonldap/NG/Portal/Main/Display.pm, sub display
- plugins modules, sub display
We should manage custom/session/env templates parameters in the same place (Portal/Main/Run.pm).