N°3190 - Edit n:n LinkedSetIndirect in object details using a tagset-like widget

- Add generic set block ui component
- Add model link set (direct and indirect) attribute (display style)
- Add model link set direct allowed values
- Create link set viewer block UI (BlockLinksSetDisplayAsProperty)
- Add set block ui factory for linkset
- Add object factory and create new endpoint in object controller (with data binder)
- Add link set model, link set repository and link set data transformer services

css/backoffice/application/_all.scss

@@ -3,5 +3,7 @@
  * @license     http://opensource.org/licenses/AGPL-3.0
  */
 
+@import "bulk/all";
 @import "display-block/all";
+@import "linked-set/all";
 @import "tabular-fields/all";