RFR: 8211234: Open-source simple test programs for FX / Swing interop [v2]

[Jayathirth D V]

> This PR is for open-sourcing 2 closed toys EmbeddedSwing and HelloWorld.
> JBS : https://bugs.openjdk.org/browse/JDK-8211234
> 
> 1)EmbeddedSwing - a simple FX test app with a SwingNode containing a Swing application
> 
> 2)HelloWorld contains 2 test apps :
> 
> - HelloJFXPanel - a simple Swing test app with a JButton and a JFXPanel containing an animated rectangle
> 
> - HelloJFXPanel2 - a simple Swing test app with a JButton and a JFXPanel containing a JavaFX Button and ComboBox (with Tooltips) 
> 
> These new test apps are added under apps/toys/ directory.

Jayathirth D V has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains two commits:

 - Resolve conflicts using latest upstream change
 - 8211234: Open-source simple test programs for FX / Swing interop

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Changes: https://git.openjdk.org/jfx/pull/1572/files
  Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=1572&range=01
  Stats: 1293 lines in 18 files changed: 1272 ins; 2 del; 19 mod
  Patch: https://git.openjdk.org/jfx/pull/1572.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1572/head:pull/1572

PR: https://git.openjdk.org/jfx/pull/1572