[code-reflection] Integrated: Cleaning up HAT/Optkl transformers. Also removed dead transformer code

[Gary Frost]

Removed dead transformer experimental code.  

Closing in on using opttkl.Txfrmr. 

Moved code down to optkl lib where possible

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Commit messages:
 - Cleaning up HAT/Optkl transformers. Also removed dead transformer code

Changes: https://git.openjdk.org/babylon/pull/796/files
  Webrev: https://webrevs.openjdk.org/?repo=babylon&pr=796&range=00
  Stats: 2432 lines in 29 files changed: 627 ins; 1754 del; 51 mod
  Patch: https://git.openjdk.org/babylon/pull/796.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/796/head:pull/796

PR: https://git.openjdk.org/babylon/pull/796