Add dependency checks for Plastic.

Review Request #12552 — Created Aug. 18, 2022 and submitted — Latest diff uploaded

Information

RBTools
release-4.x

Reviewers

This updates PlasticClient to add formal support for dependency
checks. PlasticClient.check_dependencies() now determines if cm is
installed.

PlasticClient.get_local_path() now calls this instead of checking for
dependencies itself, emitting a warning if dependencies haven't already
been checked via setup() or has_dependencies().

Unit tests for Plastic didn't previously exist. This change adds some
dependency check tests for it.

It's unclear whether Plastic still actually works today, unfortunately,
as this was a contribution that never received updates. However this is
at least a step toward actual testing.

Unit tests pass on Python 3.7-3.11.

Commits

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