Fully custom target names in static branching

Version 7.12.1

Bug fixes

• Repair subtarget_hashes.cross() for crosses on a single grouping variable.
• Repair dynamic group() used with specialized formats (#1236, @adamaltmejd).
• Enforce tidyselect >= 1.0.0.

New features

• Allow user-defined target names in static branching with the .names argument (#1240, @maciejmotyka, @januz).

Enhancements

• Do not analyze dependencies of calls to drake_plan() (#1237, @januz).
• Error message for locked cache gives paste-able error message in Windows (#1243, @billdenney).
• Prevent stack traces from accidentally storing large amounts of data (#1253, @sclewis23).