RFR: 8217472: Add attenuation for PointLight [v7]

[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:

  Added performance 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/c5481066..31060231

Webrevs:
 - full: https://webrevs.openjdk.java.net/jfx/43/webrev.06
 - incr: https://webrevs.openjdk.java.net/jfx/43/webrev.05-06

  Stats: 457 lines in 5 files changed: 457 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