erp5_document_scanner: add an alarm which will delete outdated (>5 days old) active_process created by the dialog.

With this, we can search easily active processes used by document scanner and remove them

With the size close to the thumbnail, to replace the `new` button text

Drop the current displayed text

To translate all texts, we added more promises and queues to make sure everything works as expected

Clean up and Change all gadget's CSS rules to be prefixed by  `div[data-gadget-url$="gadget_document_scanner.html"]`

The http response should return a 200 response in case of success. The response body may contain a local reference of the uploaded image

Request body should contain the image data and the active process relative url (depending on which erp5 context the script is called)

make jslint happy

* change the `extra renderjs` parameters list to pass a Python script to call when a new image is cropped.
* change the gadget to use jio.util.ajax with the script full url (provided by the server)

Change the gadget checkValidity method to return false when:
- no thumbnail has been generated
- a thumbnail upload is in failed state