RFR: 8293883: Add test/.classpath (Eclipse)

[Andy Goryachev]

On Thu, 15 Sep 2022 21:55:20 GMT, Andy Goryachev <angorya at openjdk.org> wrote:

> Adding a tests/.classpath file to include tests/manual/controls source folder so Eclipse could see/execute manual tests there.
> 
> Also, I would rather move the sources there to a specific package (test.manual ?) instead of a default package. Any objections?
> edit: won't be done as a part of this PR.

Added more dirs under manual/ and performance/ - had to skip certain directories that looked like projects in their own right, or that required additional dependencies.

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PR: https://git.openjdk.org/jfx/pull/901