Add a check browser functionnality, to ensure end user uses compatible software

Please add a browser check functionnality, to ensure end user uses compatible software.

If the browser (and OS) used is NOT compatible with the site :

• it would display a message to the user to let him know what's used is NOT compatible
• it could make recommandations of other software to use with same OS
• it could make recommandation to upgrade OS is it's really too old (and no compatible browser exists)
• it could (perhaps) indicate what will NOT work
• it could block access

The aim is to ensure user will have a good experience with Moodle. That could not be the case if software used is not appropriate.

A plugin doing this sort of thing existed (but old and never updated) : https://moodle.org/plugins/local_compatability_test

The whole system, and different checks should be (de)activable by admin.

This could be integrated with a simple compatibility check, and extended later to add more checks, recommandations...