RFR: 8217472: Add attenuation for PointLight [v16]

[Nir Lisker]

> CSR: https://bugs.openjdk.java.net/browse/JDK-8218264

Nir Lisker has updated the pull request incrementally with one additional commit since the last revision:

  Fixed test

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Changes:
  - all: https://git.openjdk.java.net/jfx/pull/43/files
  - new: https://git.openjdk.java.net/jfx/pull/43/files/e1fdf8e2..475e1bd2

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jfx&pr=43&range=15
 - incr: https://webrevs.openjdk.java.net/?repo=jfx&pr=43&range=14-15

  Stats: 7 lines in 1 file changed: 6 ins; 1 del; 0 mod
  Patch: https://git.openjdk.java.net/jfx/pull/43.diff
  Fetch: git fetch https://git.openjdk.java.net/jfx pull/43/head:pull/43

PR: https://git.openjdk.java.net/jfx/pull/43