RFR: 6900: Switch from IPredicate to Predicate

[Marcus Hirt]

Also small updates to the spotbugs exclude file. I'll open a separate issue for going through the spotbugs results and
fixing some problems separately.

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Commit messages:
 - Formatting
 - Updating copyright years
 - 6900: Switch from IPredicate to Predicate

Changes: https://git.openjdk.java.net/jmc/pull/126/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jmc&pr=126&range=00
  Issue: https://bugs.openjdk.java.net/browse/JMC-6900
  Stats: 339 lines in 25 files changed: 29 ins; 80 del; 230 mod
  Patch: https://git.openjdk.java.net/jmc/pull/126.diff
  Fetch: git fetch https://git.openjdk.java.net/jmc pull/126/head:pull/126

PR: https://git.openjdk.java.net/jmc/pull/126