Dropfile vault management

@Wissam-Halimi  The code included in this version affects 2 files:
* la/file_drop.xml:  The code has been adapted in order to store the files in the VAULT space (if it exists) or in the current space if there is no VAULT space or we are not working with ILS. It is expected to be working in the old GRASP. For the new one, the implementation will be adapted depending on the decisions to be made regarding VAULT
* libs/dropzone/dropzone.min.js: I have updated the dropzone library since the new version fixes some bugs