RFR: 8234920: Add SpotLight to the selection of 3D light types [v9]

[Nir Lisker]

On Fri, 9 Apr 2021 20:50:55 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

> I ran it, but didn't spend any time looking at how convenient it would be from an API point of view.

I meant convenient for the user. My main concern is that just using rotation transforms will be frustrating because they don't always behave very intuitively. In any case, since we are going to have rotations work anyway, I'll implement option 2 with both rotations and direction, and we can check if the direction helps (leaving the direction at its default is effectively option 1).

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PR: https://git.openjdk.java.net/jfx/pull/334