RFR: 8231601: Update CONTRIBUTING.md to clarify process for contributing features plus Skara changes [v5]

[Johan Vos]

On Thu, 16 Dec 2021 21:26:29 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

>> This PR updates the `CONTRIBUTING.md` guide to address the following:
>> 
>> 1. Clarify the process for adding new features / API changes, specifically that they must be discussed on the mailing list as the first step.
>> 2. Add a link to the mailing list in the section regarding contributing bug fixes.
>> 3. Remove the text about cross-linking the PR and JBS issue, and add a note that the Skara tooling takes care of this
>> 4. Remove the section about manually resolving the JBS issue, and add a note that the Skara bot automatically does this when the PR is integrated.
>> 5. Suggest the use of the "/reviewers 2" and "/csr" commands when appropriate
>> 6. Update the note regarding which JDK(s) to use.
>
> Kevin Rushforth has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Minor updates to address pending review comments that I did last year, but forgot to push

CONTRIBUTING.md line 57:

> 55:     A developer with an active OpenJDK ID can file a bug directly in JBS.
> 56: 
> 57: TIP: A GitHub pull request (PR) should not be the first time we hear about your proposed change to OpenJFX. Unless clearly identified as a Draft or work-in-progress (WIP), we will usually close a pull request that isn't associated with an existing bug report. Reading the policies below will help you in getting your change approved.

forward reference to Draft or WIP, so maybe add (as explained later)?

CONTRIBUTING.md line 179:

> 177: with the environment variable `JAVA_HOME` referencing the path to Java home for
> 178: your JDK installation. By default, tests use the same runtime as `JAVA_HOME`.
> 179: Currently OpenJFX builds are running on JDK 11 through JDK 15. JDK 14 is recommended.

JDK 17

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PR: https://git.openjdk.java.net/jfx/pull/303