RFR: 8289255: update Eclipse .classpath and other configuration files

[Andy Goryachev]

On Thu, 30 Jun 2022 15:30:56 GMT, Nir Lisker <nlisker at openjdk.org> wrote:

>> summary of changes:
>> - fixed .classpath files
>> - set UTF-8 encoding in the eclipse project config files
>
> I scheduled to review this today or tomorrow.

@nlisker are the changes acceptable or do we need more work?  I'd like to merge this PR because otherwise I have to cherry pick to submit other PRs, and cherry picking is not a good idea, generally speaking.
thank you.

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PR: https://git.openjdk.org/jfx/pull/804