RFR: 8220266: add support for additional metadata in add/remove programs

[Alexey Semenyuk]

Add support for --about-url, --win-update-url and --win-help-url parameters

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Commit messages:
 - Remove unused import-s
 - 8220266: add support for additional metadata in add/remove programs

Changes: https://git.openjdk.java.net/jdk/pull/3178/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=3178&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8220266
  Stats: 573 lines in 9 files changed: 563 ins; 0 del; 10 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3178.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3178/head:pull/3178

PR: https://git.openjdk.java.net/jdk/pull/3178