RFR: 8313181: Enabling modern media controls on webkit 616.1 does not load button images on HTML5 video Element

[Jay Bhaskar]

Issue : Enabling modern media controls on webkit 616.1 does not load button images on HTML5 Video Element
Solution: Add resources and correct MediaControl Stylesheet

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Commit messages:
 - use smart pointer to avoid memory leak
 - Adding simple tool based on python to generate base64 code for images
 - 8313181:Enabling modern media controls on webkit 616.1 does not load button images on HTML5 video Element

Changes: https://git.openjdk.org/jfx/pull/1201/files
 Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=1201&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8313181
  Stats: 281 lines in 12 files changed: 275 ins; 1 del; 5 mod
  Patch: https://git.openjdk.org/jfx/pull/1201.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1201/head:pull/1201

PR: https://git.openjdk.org/jfx/pull/1201