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

[Andy Goryachev]

On Mon, 27 Jun 2022 23:58:51 GMT, Nir Lisker <nlisker 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.

@nlisker:
The goal of this PR is to unblock me for the further fixes in Eclipse, as the project currently does not compile in Eclipse.  I am sure there is more work in /apps, but at least it compiles now.

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

not sure why the last commit got pushed to this branch, will revert shortly.  thanks!

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