[Rev 01] RFR: 8244531: Tests: add support to identify recurring issues with controls et al

[Jeanette Winzenburg]

> It's a task to support cross-control/skin testing for recurring issues (like memory leaks on switching skins)
> 
> Basically, there's a utility class
> - to access lists of all control/classes,
> - to access/create all behaviors
> - has alternative skins classes for all controls and utility to install/replace skins
> 
> POC:
> - has test examples (not run in normal testing due to not following naming conventions) for using
> - changed SkinDisposeContractTest to use

Jeanette Winzenburg has updated the pull request incrementally with one additional commit since the last revision:

  code/doc changes as requested in review
  
  added Skin/BehaviorMemoryLeakTest

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

Changes:
  - all: https://git.openjdk.java.net/jfx/pull/223/files
  - new: https://git.openjdk.java.net/jfx/pull/223/files/e1a1a459..d11d304b

Webrevs:
 - full: https://webrevs.openjdk.java.net/jfx/223/webrev.01
 - incr: https://webrevs.openjdk.java.net/jfx/223/webrev.00-01

  Stats: 336 lines in 4 files changed: 332 ins; 3 del; 1 mod
  Patch: https://git.openjdk.java.net/jfx/pull/223.diff
  Fetch: git fetch https://git.openjdk.java.net/jfx pull/223/head:pull/223

PR: https://git.openjdk.java.net/jfx/pull/223