RFR: 7903840: apidiff: optionally show expansion of `--jdk-build` [v2]

[Jonathan Gibbons]

> Please review a small-ish PR to add support for `--verbose options` which outputs details about the upfront option handling.

Jonathan Gibbons has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains four commits:

 - fix copyright years
 - merge with upstream/master
 - fix test compilation failure, and fix some IDE suggestions
 - CODETOOLS-7903840: apidiff: optionally show expansion of `--jdk-build`

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Changes: https://git.openjdk.org/apidiff/pull/19/files
  Webrev: https://webrevs.openjdk.org/?repo=apidiff&pr=19&range=01
  Stats: 125 lines in 6 files changed: 99 ins; 1 del; 25 mod
  Patch: https://git.openjdk.org/apidiff/pull/19.diff
  Fetch: git fetch https://git.openjdk.org/apidiff.git pull/19/head:pull/19

PR: https://git.openjdk.org/apidiff/pull/19