* Make flags.chatRevoked prevent sending private messages (issue #7971)
* Disallow sending gems when messages aren't allowed.
* Created function to check for objections to an interaction to user model and wired it into the API (issue #7971)
* Fixes for issues raised by reviewers.
* Added allowed values to apidoc for api.getObjectionsToInteraction.
* Refactoring of getObjectionsToInteraction and minor API changes.
* fix(objections): address PR comments
* fix(strings): use US English for base edits
* refactor(test): typos and phrasing