RFR: 8290844: Add Skin.install() method [v19]

[Kevin Rushforth]

On Mon, 31 Oct 2022 16:42:34 GMT, Andy Goryachev <angorya at openjdk.org> wrote:

>> - added Skin.install()
>> - javadoc changes for Skinnable.setSkin(Skin)
>
> Andy Goryachev has updated the pull request incrementally with one additional commit since the last revision:
> 
>   8290844: review comments

All looks good to me.

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Marked as reviewed by kcr (Lead).

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