Improved RDA Export

Reworked RDA export, now uses JBuilder

Simple registries with label should not have the value id as the select value

Solved issue where simple registry values were value ids instead of value label

Moved templates & registry values into properly named repositories

RDA export : how changed contributors are displayed & fixed some issues with ethicalIssues data

Solved issue where removing a selected registry value didn't removed the value from the fragment

Removed erroneous char

'DELETED' value shouldn't be saved in DB

Some code optimization

Textarea field content is now properly displayed when field is set as readonly

Added Contributor Field

Solved issue where users couldn't save multiple values from a registry

Constant field are now hidden field with displayed value

User can add custom values to complex multiple registries & homogenised custom value behaviour

Added hidden_field

Integrated Select2 and first version of Registry selectable multiple times

Simple registries can now have a label different from the value

User can now put his own value when a registry is overridable

Complex registries values should be saved into a madmp_fragment

Implemented a first version of the RDA export

Some fixes to direct_link tooltips

Solved issue with fragment list & removed some unused code

Merged feature/registries into dev

Solved post merge issue with registries select field

Merged dev

Adjustments for contributors save

Deleting a value from the form should save the form correctly

Added required indicator on fields, modal shouldn't save when required field are not filled

Solved Tinymce display issues (for real this time)