Server-side pictures buffer implemented
New Features:
- Is now possible to specify how many pictures to keep on the server. They're gonna receive a prefix with their position and be renamed every time a new picture come in, until they get deleted once enough new pictures have been uploaded.
- The setup-server now allows the users to see and download the execution logs of the test picture. Test picture preview still TBD.
- Various fixes/improvements to the setup server and the webcam code