Move cavity properties to a separate subpanel, instead of being in-between unrelated settings. Avoids issues with add-ons appending to the "Options" subpanel, which would push cavity properties back to the middle. Properties are now greyed out (instead of hidden) when unavailable due to X-Ray being enabled. More details and screenshots in pull request. Pull Request: https://projects.blender.org/blender/blender/pulls/133944