RFR: 8290844: Add Skin.install() method [v20]

[Kevin Rushforth]

On Thu, 3 Nov 2022 15:49:07 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

Marked as reviewed by kcr (Lead).

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