RFR: 8217472: Add attenuation for PointLight [v13]

[Nir Lisker]

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

Nir Lisker has updated the pull request incrementally with two additional commits since the last revision:

 - Fixed whitespaces
 - Added an automated 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/d3dd5064..af0b1794

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jfx&pr=43&range=12
 - incr: https://webrevs.openjdk.java.net/?repo=jfx&pr=43&range=11-12

  Stats: 116 lines in 1 file changed: 116 ins; 0 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