RFR: 8337246: SpinnerSkin does not consume ENTER KeyEvent when editor ActionEvent is consumed

[John Hendrikx]

This is a proof of concept fix for the linked issue.

We'll need to discuss if using an event filter in the Behavior is the appropriate fix and how much impact this may have on current applications.

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Commit messages:
 - Proof of concept fix for Spinner event handling

Changes: https://git.openjdk.org/jfx/pull/1629/files
  Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=1629&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8337246
  Stats: 74 lines in 2 files changed: 22 ins; 35 del; 17 mod
  Patch: https://git.openjdk.org/jfx/pull/1629.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1629/head:pull/1629

PR: https://git.openjdk.org/jfx/pull/1629