Fixed bugs

* Removed: the pdfwriter is no longer built
* Changed: the zip reports and tmp folders are now cleaned during
startup
* Changed: it is now possible to choose a file from any file explorer
instead of taking a picture
* Changed: pictures chosen from outside our folder are not deleted
during clean time or when deleting the associated report
* Moved: the PictureCleanerService
* Changed: Create the .nomedia file at the root of our folder