Removed TODOs already covered by https://github.com/phetsims/phet-io/issues/855, see https://github.com/phetsims/phet-io/issues/44
Removed TODOs already covered by https://github.com/phetsims/phet-io/issues/855, see https://github.com/phetsims/phet-io/issues/44

phetsims/tandem,phetsims/tandem,phetsims/tandem