refactor: move compensation menu so it can be relocated added elsewhere

[blaggacao]

This is useful, e.g. for plugins, to call into the compensation menu. Concrete example: a probing plugin.

This would help me a bit to organize and eventually upstream my private patches. See also: https://forum.duet3d.com/topic/38582/my-dwc-patches

[blaggacao]

[blaggacao]

@chrishamm this now targets v3.7-dev as well, as requested in the forum. It aims not to change any functionality.

[chrishamm]

Thanks, that change looks alright to me. I can accept it once the new conflicts have been resolved.

[github-actions]

Thank you for your submission, we really appreciate it. Like many open-source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution. You can sign the CLA by just posting a Pull Request Comment same as the below format.

---

I have read the Duet3D CLA v2.0 and I hereby sign it

---

_{You can retrigger this bot by commenting recheck in this Pull Request. Posted by the CLA Assistant Lite bot.}