<i18n dev> RFR: 6453901: (cal) clean up sun.util.calendar classes

Thu Mar 2 23:49:00 UTC 2023

This PR includes cleanup changes to the sun.util.calendar package only.

The changes include removing unused methods, imports, adjusting incorrect links, and using newer syntax patterns. Since there are no plans to promote any of these classes to java.calendar, these unused methods can be removed.

Mach5: https://mach5.us.oracle.com/mdash/jobs/jclu-jdk2-20230228-2223-42671403

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Commit messages:
 - Additional unused method: CalendarDate.addSeconds()
 - Merge branch 'master' into 6453901-CalCleanUp
 - Copyright years
 - Unused methods, imports, variables. Pattern instance, Java array dec

Changes: https://git.openjdk.org/jdk/pull/12817/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=12817&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-6453901
  Stats: 211 lines in 10 files changed: 1 ins; 182 del; 28 mod
  Patch: https://git.openjdk.org/jdk/pull/12817.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/12817/head:pull/12817

PR: https://git.openjdk.org/jdk/pull/12817