Bug fixed:
creating UserField Entity fails

Bugs fixed

• error if image file is set as required field and no image is uploaded
• image entity not deleted after deleted last attachment for one field
• add custom fields database changes after resource manager install

New Features

• Calculation field
  • with new dependency to loaded library via composer nxp/math-executor
• added field id into field list view to grab easily an field if for calculation

Improvements

• switched from listener to Entity Extension with trait, to use entity functions for needed checks
• moved development help into AdminCP Page

Fixed Bug which occurs when editing a post with attachments. The Insert Button was gone..
Optimized Code, minor things
added Developer Help

succesfully tested on actual version