pantsbuild / pants / 4461

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An implementation of Subsystems.

- Provides a Subsystem base class.
- Provides all the machinery for declaring subsystem use,
  subsystem option registration etc.

To keep this change reasonably-sized, no actual subsystems are provided.
However I have battle-tested this code by retrofitting two existing
classes (RunTracker and JarTool) to be subsystems. That code will
be submitted in a separate change, for ease of review.

Testing Done:
CI passes, apart from presumably-unrelated jar shading issues:
https://travis-ci.org/pantsbuild/pants/builds/58083895
(the failing test passes when I run it locally)

Reviewed at https://rbcommons.com/s/twitter/r/2063/

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