Add a ModMenuOptions attribute.

[dplochcoder]

Summary of Changes

Adds an attribute for finite choice lists from predetermined constant values.

Checklist

• No change is too small for a release, so pick one:
  • I have updated the package version following semantic versioning
  • There is another change actively WIP that will update the version (link issue or PR here)
  • This PR does not update user-facing code/config
  • I'm not sure how to set the version and would like the reviewer's help