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

[Kevin Rushforth]

On Fri, 30 Oct 2020 11:52:03 GMT, Nir Lisker <nlisker at openjdk.org> wrote:

> Is the old implementation worth looking at, or is is completely different?

No, the Java 3D implementation was done using fixed-function pipeline (not shaders), so not really a good starting point.

> Another API point is how to implement the direction - a Point3D or 3 doubles.

Yes, we need to sort this one out for `SpotLight`. This is a direction vector similar to the rotation axis in `Rotate`, so using `Point3D` for this property seems most consistent.

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