RFR: 8289384: Fix warnings: method does not override the inherited method since it is private to a different package

[Nir Lisker]

On Fri, 8 Jul 2022 21:37:47 GMT, Andy Goryachev <duke at openjdk.org> wrote:

> The fix includes:
> - renaming of offending methods to avoid confusion
> - explicitly declaring the offending methods as private

I personally disabled the "does not override method in a different package" warning. The synthetic methods one I never had on and never knew existed even, I don't see any reason for it.

Unused imports and missing `@Override`s should be fixed in my opinion. It's just that the fixes make a lot of noise and touch many files. The graphics module fix might need to be split up because it's huge.

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PR: https://git.openjdk.org/jfx/pull/824