Sync shared classes

[cfoellmann]

When code style is enforced files/classes shared across projects will differ - even same versions. That is a bad idea/thing.

Examples

• https://github.com/podlove/podlove-subscribe-button-wp-plugin/blob/master/model/base.php <-> https://github.com/podlove/podlove-publisher/blob/master/lib/model/base.php