First draft of the CsvReader
Reworked the CSV reader so now it accepts only files
Somehow the setFile() function was empty…
Merge branch 'hotfix/3.0.3'
Merge branch 'release/4.0.0'
Improvements and fixes for \File\CsvReader class
Fixed the filters HTML markup in Model\Relations
Revert "Fixed the filters HTML markup in Model\Relations"

This reverts commit 69a85ab21dc300148860aa7d18261cb96e3442e0.
Fixed the filters HTML markup in Model\Relations
Fixed a bug in the relations that purged data on every save_callback
Convert optgroups so they work with FormSelectMenu
Fixed options converter
Fixed weight calculation
Deleted CHANGELOG, there's a GIT history anyway
Merge branch 'hotfix/4.0.1' into develop
Merge branch 'hotfix/4.0.1'
Added the File\CsvReader documentation
Added the File\CsvWriter class
added optional options on json response
added depth to setContent method of JsonResponse