RFR: 8270107: Open source FXMediaPlayer test app

Fri Aug 27 23:36:26 UTC 2021

On Fri, 27 Aug 2021 22:06:31 GMT, Alexander Matveev <almatvee at openjdk.org> wrote:

> - 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.

By way of background this is a lightly cleaned up version of a closed-source test program that we are open sourcing in order to facilitate testing various media features.

Even though it is a test program, I'd like a second pair of eyes on it.

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