Prepare for next Papyrus version based on Sirius

[nuthub]

Monitor "Discussions" and "papyrus-desktop" for updates of Papyrus: https://gitlab.eclipse.org/eclipse/papyrus/

Papyrus 7.1.0 has been released and CARiSMA release 2025-12 includes this version.
Things that still need to be done, once the Sirius based editor works as expected:

• Migration of example models (see Prepare for next Papyrus version based on Sirius #52 (comment))
• Update of documentation
• Update of screenshots

[Original Issue text]
Papyrus will switch to Sirius as basis in the next version (planned for 2024-12):
https://www.eclipse.org/forums/index.php/m/1867518/#msg_1867518

[nuthub]

We need to check, whether new models created with Sirius will work with our current CARiSMA check implementations.
Maybe, we should create additional models or update existing models for our automated tests.

[nuthub]

Papyrus 7.0 based on Sirius/EEF will probably be released in the first half of 2025; testing is possible earlier:
https://www.eclipse.org/lists/mdt-papyrus.dev/msg04533.html

[nuthub]

Discussions about + Development of Papyrus / Sirius happens at new GitLab-SubGroup/Projects: https://gitlab.eclipse.org/eclipse/papyrus

[nuthub]

Papyrus 7 was released end of June 2025 and uses Sirius now.