Record setback for testing instances

[darupp]

To avoid errors in testing environments that result in existing titles, there should be the possibility to set back an instance via cronjob. The setback should be restricted to titles, packages, tipps, NOT to orgs, platforms, namespaces, users and so on.

This is manually given:

• Select all packages, batch delete all packages
• Select all titles, batch delete all titles

There should be additionally a configurable cronjob for this.