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

[Andy Goryachev]

On Mon, 27 Jun 2022 23:19:36 GMT, Andy Goryachev <duke at openjdk.org> wrote:

> summary of changes:
> - fixed .classpath files
> - set UTF-8 encoding in the eclipse project config files
> - fixed gradlew to use UTF-8 encoding

Very similar indeed.  The latest version  2022-06 (4.24.0) complained more, so this PR touched more files.  I wonder if #514 will have zero diffs (save for XML ordering) once this PR is merged (integrated?).
I would definitely volunteer to review the remaining changes (once I accumulate enough karma).

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