Thanks to Nikita Hovratov for this version!

 Important
- After updating from 5.1.0 or lower, clear the hard caches under Maintenance-Flush cache. Clearing red caches in not enough.
- Run database analyzer after that.

 Added
- Mask uses now the symfony DI.
- Added fe_group and editlock fields for access tab of mask inline records.

 Fixed
- Labels of inline tt_content records having a mask element as default are now displayed. [327](https://github.com/Gernott/mask/pull/327)