Convenience functions done() and cancelled()

[wlandau]

Prework

• Read and abide by drake's code of conduct.
• Search for duplicates among the existing issues, both open and closed.

Proposal

Like failed() and running(), done() and cancelled() should list done and cancelled targets.

[wlandau]

done() conflicts with rlang::done(). Should probably put a drake_ prefix before the names of all progress utilities.

[wlandau]

Deprecated and renamed several a few functions that were part of previous releases. The old functions will continue working for about a year or two before they become defunct.

• progress() => drake_progress()
• running() => drake_running()
• failed() => drake_failed()