Refactor publishing code

Cache pages with aggregations separately for regular and priviledged users

Minor HTML change in banner

Wrap versioning info in its own span

added diff links to banner

try to autoincrease the last version

Check user roles before approving or publishing

added more docblocks and some reformatting

allow setting datetime of Revision by unix timestamp

reworking the banner system

* more prose in the banner texts
* status icon
* more logic checks

Styling still needs more love

Change date to datetime

Latest published revision is a Revision object

Database migration adjustments

Update assignments when patterns are added

correctly handle multiple assignments

NOTE: minimum requirement is PHP 7.4 now

move all constants to their own class

make it easier to check permissions for the current user

fix deny behavior when no published version is available

avoid infinite loop on initialization

Fix path to migration file

Include structpublish schema import in migration

Update schema data on publish

Register custom sqlite function via event

Remove obsolete helper

Cleaner access to revision data

Working check whether current user may see not only published revisions