- Added/Updated headers
- Added script to update copyright headers

- corrected unitary test file for device component
- arranged clients used by optical centralized attack detector
- Minor corrections in unitary test of Context component
- corrected skeleton for unitary tests of Slice component

Minor changes to prevent errors in GitLab CI pipeline. Still partial implementation of "slice" component skeleton.

- Initial (unfinished) version of Slice component
- Factorized and improved check methods from "device" and "service" components to align with "slice" component