RFR: 8290844: Add Skin.install() method [v18]

[Andy Goryachev]

On Sat, 29 Oct 2022 00:06:38 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

>> Called once when {@link Skin} is *initially* set, or after the... ?
>
> I would just remove the "or". It's correct without it, and less wordy.

Thank you @kevinrushforth  for suggesting an alternative (offline).

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PR: https://git.openjdk.org/jfx/pull/845