RFR: JDK-8321984: IGV: Upgrade to Netbeans Platform 20 [v4]

[Tobias Holenstein]

On Thu, 18 Jan 2024 11:50:29 GMT, Tobias Holenstein <tholenstein at openjdk.org> wrote:

>> Upgraded IGV and dependencies to the newest Netbeans Platform 20 which was released on December 2023.
>> 
>> Tested that IGV still behaves as expected after the upgrade.
>
> Tobias Holenstein has refreshed the contents of this pull request, and previous commits have been removed. The incremental views will show differences compared to the previous content of the PR. The pull request contains two new commits since the last revision:
> 
>  - make IGV build work with mainline JDK version
>  - remove requirement for nashorn

You can now also build IGV with `JAVA_HOME=path_to_mainline_jdk mvn clean install` by using a mainline JDK build

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PR Comment: https://git.openjdk.org/jdk/pull/17106#issuecomment-1898344458