Since the Facebook API has changed and additional permissions are required for all users on a pod to cross-post, an additional 'authorized' flag is needed to be set for the Facebook service.
This flag allows either all users, one user or no users to use the cross-posting service.

Clarifies the situation for #5923, #5260 and #5085.

closes #5985

Added AppConfig.privacy.statistics.deprecated_format to toggle showing the old style format.

Currently there is a bug in configurate that reports incorrectly the services settings if they are set as ENV variables, instead of diaspora.yml settings.
This commit works around that issue by changing the way the setting is fetched.

Services have been added to /statistics.json

tidying up

edits

fixeds tests for comment count in statistics

added changelog entry and default entry

Statistics route with general info, some user and total posts stats. By default statistics off, enabled in settings.