RFR: 8297554: Remove Scene.KeyHandler [v3]

[Michael Strauß]

On Tue, 20 Dec 2022 20:20:55 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

> @mstr2 The fix looks fine to me. I presume you have done enough testing to ensure no regressions?
> 

I tested it by running it against SceneBuilder and playing around with focus, where I noticed no regressions.

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PR: https://git.openjdk.org/jfx/pull/962