RFR: automatic module names added (added to MANIFEST at buildtime)

[Hendrik Ebbers]

`maven-jar-plugin` is used to add "Automatic-Module-Name" to `MANIFEST.MF` at buildtime. This is the minimum that is needed if you want to use the lib on the module path in a project.

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Commit messages:
 - automatic module names added (added to MANIFEST at buildtime)

Changes: https://git.openjdk.org/jmh/pull/90/files
 Webrev: https://webrevs.openjdk.org/?repo=jmh&pr=90&range=00
  Stats: 61 lines in 6 files changed: 59 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jmh/pull/90.diff
  Fetch: git fetch https://git.openjdk.org/jmh pull/90/head:pull/90

PR: https://git.openjdk.org/jmh/pull/90