[code-reflection] RFR: Sync with babylon changes and moved/renamed dirs for consistency

[Gary Frost]

This PR syncs with Babyon changes. 

Mostly from the HAT side this is a bunch of project/dir renames/moves to maintain a consistent pattern across the project.

I added a new tools project.  Here I plan on adding some of the tooling that I use to debug. Previously this was in core. 

Now core depende on tools. 

Move a few things out from core (into tools) which were unused by hat libs and apps.  They will be used by incomming tooling.

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Commit messages:
 - Sync with upstream babylon changes and moved/renamed dirs for consistency"

Changes: https://git.openjdk.org/babylon/pull/480/files
  Webrev: https://webrevs.openjdk.org/?repo=babylon&pr=480&range=00
  Stats: 991 lines in 100 files changed: 361 ins; 421 del; 209 mod
  Patch: https://git.openjdk.org/babylon/pull/480.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/480/head:pull/480

PR: https://git.openjdk.org/babylon/pull/480