Ac#1102/custom annotations

[smnhgn]

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• I gave the PR a meaningful name
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Summary

• Visuelle Überarbeitung von Annotations (Zelle, KontextMenü, EntityView)
• Konfiguration (Titel, Farbe etc.) von Annotations über das Backend (inkl. Möglichkeit zur Erweiterung)
• Farbliches Hervorheben von Zellen mit bestimmter Annotation