Feature/dropzone

! Merged branche with feature/datagrid to use the api-mocker in this branch. Please merge feature/datagrid first: https://github.com/massiveart/husky/pull/294

- [x] finish the code
- [x] gather feedback for my changes

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | yes
| Tests pass?   | none
| Fixed tickets | none
| Doc           | none