RFR: 8270107: Open source FXMediaPlayer test app

[Alexander Matveev]

- Added FXMediaPlayer test application.
 - This app uses all media APIs and very handy in verifying media builds during development.
 - It can be compiled and run by running "ant" and "ant run" in tests/manual/media/FXMediaPlayer.

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Commit messages:
 - 8270107: Open source FXMediaPlayer test app

Changes: https://git.openjdk.java.net/jfx/pull/613/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jfx&pr=613&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8270107
  Stats: 5970 lines in 26 files changed: 5970 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jfx/pull/613.diff
  Fetch: git fetch https://git.openjdk.java.net/jfx pull/613/head:pull/613

PR: https://git.openjdk.java.net/jfx/pull/613