MOAC v1.2.0

- More accurate entropy estimations with some charset de-deuplication
- The library now has the BuildCharsets func exported
- Add reproducible builds
- CLI programs now sanitize unwanted characters in custom charsets

This should be the last minor 1.x release; development will now shift
towards v2.0.0, with occasional patches to 1.2 if necessary.

Rohan Kumar (19):
      Build(install): create missing dir for completion
      Doc: add info on changelogs, tests, and CII badge
      Doc: README: add badge, more install instructions
      Fix: remove more instances of charset shadowing
      Feat: export func BuildCharsets
      Fix: correctly subset charsets, with tests
      Test: add tests for BuildCharsets
      Build: use standard install/uninstall make targets
      Chore: add more lint/test hooks to Makefile
      Doc: add upgrade/uninstall/contribution info
      Chore: add formatters to Makefile by path
      Test: refactor pwgen tests for perf + edge cases
      Doc: clarify MOAC's approach to grapheme clusters
      Build: support reproducible dists + sanitizer bins
      Build: fix bad go flags
      Doc: add documentation on reproducible builds
      Chore(CI): trivial fix for Fedora build job
      Test: test uncovered case in moac/entropy
      Feat(CLI): sanitize bad characters from user input