[Rev 03] RFR: 8217472: Add attenuation for PointLight

[Nir Lisker]

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

The pull request has been updated with 1 additional commit.

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Added commits:
 - 66cdab32: Attenuation and range changed internally to floats from doubles

Changes:
  - all: https://git.openjdk.java.net/jfx/pull/43/files
  - new: https://git.openjdk.java.net/jfx/pull/43/files/464e8b5d..66cdab32

Webrevs:
 - full: https://webrevs.openjdk.java.net/jfx/43/webrev.03
 - incr: https://webrevs.openjdk.java.net/jfx/43/webrev.02-03

  Stats: 32 lines in 3 files changed: 0 ins; 0 del; 32 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