Give configuration warning if Anonymous role is granted inappropriate permissions

There is almost never a reason to grant 'access CiviEvent', 'access CiviContribute' (i.e. 'access $component') to the anonymous role. However some sites are configured this way due to confusion about permissions required to allow anonymous constituents to make contributions, register for events, etc.).

We can help prevent mis-configurations by checking for unexpected assignment of component permissions to the anonymous role and warn the administrator.

This task will require creation of a new System class which can query the host CMS for the CiviCRM permissions granted to a specific role.