* new helper: get classifiers, index 0 has all the files in all the folders, index 1 has the list of the name of the folders.
* the new study has now a not mandatory input that allows to select the classifiers.
* I copied the classifiers from /storage/app/classifiers to public/images/classifiers. This needs to be done everytime a new folder is created in storage.
* started interview interface: now classifiers shows at the bottom of the sorting. Wrote already what to do.