Auditree-framework

- [ADDED] Documentation on how to use it with 1Password CLI.
- [CHANGED] "--creds-path" does not default to "~/.credentials". (BREAKING)
- [FIXED] Number of errors/warnings shown correctly for single checks.

- [FIXED] Update pre-commit dependencies.
- [CHANGED] Use python 3.8 in GitHub Actions as newer flake8 does not support less than that.
- [CHANGED] Dot not update pre-commit hooks during "make develop".
- [ADDED] Add basic pre-commit hooks.
- [FIXED] Support for agent signing of binary content.
- [FIXED] Demo fetcher/check for World Clock API replaced with GitHub API example.
- [ADDED] Documentation about using parameterized.
- [CHANGED] Unify github demo code in one single place.
- [FIXED] flake8 now scans demo code too.
- [CHANGED] Removed yapf in favour of black as code formatter.

- [ADDED] Locker shallow clone depth configuration.
- [ADDED] Multiple remote lockers for fetching evidence.
- [FIXED] Correctly acquire the locker lock when iterating repository commits.
- [FIXED] Raise the `EvidenceNotFoundError` exception for missing evidence.

- [FIXED] Set Python version to 3.7 in publish/deploy GH action to match other actions.

- [ADDED] Agent mode for storing cryptographically signed evidence.
- [ADDED] Configurable branch name for evidence repository.
- [ADDED] Configurable force push to remote for evidence repository.
- [ADDED] Fetcher helper for running local commands.
- [FIXED] Attempt to import missing fetchers from the include JSON configuration.

- [FIXED] Addressed PagerDuty notifier hanging and not firing pages.