[META] Plan for Menu block 8.x-1.12 release

Follow-up from 🌱 [META] Plan for Menu block 8.x-1.8 release Fixed .

Planned:

✨ Add option to always render parent menu item Fixed
✨ Hide menu block on pages not included in menu Fixed
✨ Add option to show block if menu tree contains no links Needs work
✨ Show items on same level if active menu level doesn't have children RTBC

Completed