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

[Nir Lisker]

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

There is already an open issue for this in [JDK-8221708](https://bugs.openjdk.org/browse/JDK-8221708). The reason it's pending is because the OpenJFX repo is awaiting [cleanup](https://mail.openjdk.org/pipermail/openjfx-dev/2021-June/030894.html), which will require to redo the Eclipse configuration files. The changes I have pending locally are more comprehensive than those proposed here. We can review these, but it will need to be redone later anyway.

By the way, I already filed a PR to fix these previously - https://github.com/openjdk/jfx/pull/514. No one wanted to review it so it just stayed there until until it became irrelevant due to other changes.

I think that the latest commit is related to a different branch.

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