[code-reflection] Integrated: Moved job src into hat project

[Gary Frost]

We have been using job (java opinionated builder) for some time.  The code has been sitting on my local disk. 

To create job.jar (should only be needed if we change the builder source )


 bash hat/bootstrap.bash 


After that `java @hat/xxxx` will use the modified job.jar.  

Please check job.jar back in if you make changes that we need.

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Commit messages:
 - job src into hat project

Changes: https://git.openjdk.org/babylon/pull/651/files
  Webrev: https://webrevs.openjdk.org/?repo=babylon&pr=651&range=00
  Stats: 3740 lines in 31 files changed: 3723 ins; 16 del; 1 mod
  Patch: https://git.openjdk.org/babylon/pull/651.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/651/head:pull/651

PR: https://git.openjdk.org/babylon/pull/651