RFR: 8245145: Spinner: throws IllegalArgumentException when replacing skin [v5]

[Andy Goryachev]

> Fixed SpinnerSkin initialization using new Skin.install().  Also in this PR - fixing memory leaks in SpinnerSkin by properly removing all listeners and event filters added in the constructor, as well as any child Nodes.
> 
> NOTE: the fix requires both ListenerHelper [JDK-8294809](https://bugs.openjdk.org/browse/JDK-8294809) and Skin.install() [JDK-8290844](https://bugs.openjdk.org/browse/JDK-8290844) changes.

Andy Goryachev has updated the pull request incrementally with one additional commit since the last revision:

  8245145: space

-------------

Changes:
  - all: https://git.openjdk.org/jfx/pull/904/files
  - new: https://git.openjdk.org/jfx/pull/904/files/f83fc9d6..5c4880af

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jfx&pr=904&range=04
 - incr: https://webrevs.openjdk.org/?repo=jfx&pr=904&range=03-04

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jfx/pull/904.diff
  Fetch: git fetch https://git.openjdk.org/jfx pull/904/head:pull/904

PR: https://git.openjdk.org/jfx/pull/904