[code-reflection] Integrated: HAT more experiments replacing layout with schema

[Gary Frost]

More experiments replacing layouts with schema (which encapsulates layouts)

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Commit messages:
 - HAT more experiments replacing layout with schema

Changes: https://git.openjdk.org/babylon/pull/152/files
  Webrev: https://webrevs.openjdk.org/?repo=babylon&pr=152&range=00
  Stats: 1054 lines in 8 files changed: 520 ins; 351 del; 183 mod
  Patch: https://git.openjdk.org/babylon/pull/152.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/152/head:pull/152

PR: https://git.openjdk.org/babylon/pull/152