[code-reflection] Integrated: Hat remove unused tool classes

[Gary Frost]

There we some unused classes in the last check in. 

Also I moved a couple of inner classes out of FuncOpViewer. They might prove useful as standalone ui components.

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Commit messages:
 - add markdown doc for tools'
 - cleaned up recent tool checkin

Changes: https://git.openjdk.org/babylon/pull/501/files
  Webrev: https://webrevs.openjdk.org/?repo=babylon&pr=501&range=00
  Stats: 597 lines in 8 files changed: 295 ins; 300 del; 2 mod
  Patch: https://git.openjdk.org/babylon/pull/501.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/501/head:pull/501

PR: https://git.openjdk.org/babylon/pull/501