Build new VSIX which contains just the interactive window
      Rename interactive window assemblies
      Include new VSIX in the list of files to be inserted

     Public API cleanups
      Move command constants into commands namespace
      Move operations onto IInteractiveWindowOperations interface
      move IContentTypeMetadata to internal class
      Make InteractiveContentTypeNames internal, move constants to InteractiveConstants
      Make RestoreHistoryEditTag internal
      Make CommandIds internal
      Make Guids internal
      Fix AV when opening interactive window
 (changeset 1407857)