Built-in support for blocking branch and tag deletion without administrative approval.

We'd like the ability to prevent data loss from every occurring in our repositories, while still supporting administrative activities such as explicitly deleting a tag that should not have been made.

Ideally, it would be possible in Stash to forbid destructive git operations entirely – forced pushes, branch deletions, tag deletions, etc – while still offering an explicit interface for deleting/renaming branches/tags/etc by administratively approved users.