Add online task R3BOnlineSyncCheck

[morze00]

Add online task for sync check. This will need a revision when more sync values will be available in the unpacker.

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Checklist:

• [x] Rebased against dev branch
• [x] My name is in the resp. CONTRIBUTORS/AUTHORS file
• [x] Followed the pull request guidlines and the Git workflow
• [x] Followed the seven rules of great commit messages