- BC Break: Core _PHP_ framework + dependencies moved into `composer.json` and are no longer part of this repo
- Upgraded some 3rd party _Composer_ dependencies: `monolog/monolog`, `swiftmailer/swiftmailer`, `league/html-to-markdown`, `react/socket`, `react/promise-stream`
- Fixed a bug where `/setup` throws HTTP `5xx` error if no `pathfinder` DB exists
- Fixed compatibility issue with PHP `v7.4`, closed#887
- improved file structure for _Model_ classes (`app/main/model/..`). Group by database name
- improved database connection handling (fixed persistent DB connections)
- new "Redis monitoring" UI on `/setup` page, closed#745
- improved request handling for 3rd party APIs (ESI, SSO, GitHub) see [exodus4d/pathfinder_esi/README.md](https://github.com/exodus4d/pathfinder_esi/blob/b5d4b19/README.md)
- improved `/setup` page, new actions for clear cache/Redis data