The restorer imported ui/restorer which leaks ui logic into the restorer
core. Swap the direction by letting the restorer use a ProgressReporter
interface + associated constants.
* ui: restore --delete indicates number of deleted files
* adds new field `FilesDeleted` to the State struct, JSON and text progress updaters
* increment FilesDeleted count when ReportedDeletedFile
* ui: collect the files to be deleted, delete, then update the count post deletion
* docs: update scripting output fields for restore command
ui: report deleted directories and refactor function name to ReportDeletion
This keeps backwards compatibility with the previous empty structs.
And maybe we'd want to put other fields into the inner struct later,
rather than the outer message.
Michael Eischer
Srigovind Nayak
Michael Terry