RFR: 7507: Fixing project setup

[Marcus Hirt]

...and some cleanup.

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Commit messages:
 - Fixing copyright years
 - Further project files and fixes
 - 7505: Fixing project setup

Changes: https://git.openjdk.java.net/jmc/pull/355/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jmc&pr=355&range=00
  Issue: https://bugs.openjdk.java.net/browse/JMC-7507
  Stats: 239 lines in 34 files changed: 92 ins; 12 del; 135 mod
  Patch: https://git.openjdk.java.net/jmc/pull/355.diff
  Fetch: git fetch https://git.openjdk.java.net/jmc pull/355/head:pull/355

PR: https://git.openjdk.java.net/jmc/pull/355