Rework IconTest. Verified it produces the output as expected.
------------- Commit messages: - Rollback JDK-8370100 specific patch - AdditionalLauncher: make getAdditionalLauncherProperties() public; LauncherIconVerifier: make setters unambiguous; Add ConfigurationTarget - IconTest: revamp Changes: https://git.openjdk.org/jdk/pull/27883/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=27883&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8370156 Stats: 331 lines in 4 files changed: 179 ins; 68 del; 84 mod Patch: https://git.openjdk.org/jdk/pull/27883.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/27883/head:pull/27883 PR: https://git.openjdk.org/jdk/pull/27883
