RFR: 7348: JMC preference options are duplicated

Wed Jul 28 10:31:40 UTC 2021

"General" , "Appearance" and "Keys" had duplicate entry . This was due to some in consistence "org.eclipse.ui.*" Components were used (one with older + latest version which is causing duplicate entry). 

Solution : Restricted the Eclipse UI components to v3.2.0 and less than equal to 4.0.0.

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Commit messages:
 - Updated Copyright header
 - 7348: JMC preference options are duplicated

Changes: https://git.openjdk.java.net/jmc/pull/289/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jmc&pr=289&range=00
  Issue: https://bugs.openjdk.java.net/browse/JMC-7348
  Stats: 46 lines in 2 files changed: 40 ins; 0 del; 6 mod
  Patch: https://git.openjdk.java.net/jmc/pull/289.diff
  Fetch: git fetch https://git.openjdk.java.net/jmc pull/289/head:pull/289

PR: https://git.openjdk.java.net/jmc/pull/289