The controllers package has been updated to v33. The only breaking
change in this release was to rename the term "collectible" to "NFT"
wherever it appeared in the API.
Changes in this PR have been kept minimal; additional renaming can be
done in separate PRs. This PR only updates the controller names,
controller state, controller methods, and any direct references to
these things. NFTs are still called "collectibles" in most places.
