Added #17494: Advanced-search and predefined filters

New functionality

Advanced search:

• Added new advanced-search which allows filtering on backend
• Added functionality to manage private and public filters. The provided new permissions for new functionality
• Create new settings-page to manage filters

API:

• Added API to manage the predefined filters

Database:

• Added tables for predefined filters and predefined filter permissions

Testing:

• Added plenty of unit- and feature tests for the advanced search and predefined filters
• Added tests for the "old" advanced search

Screenshots

Advanced search:

Predefined filter create modal:

Predefined filter settings page