RFR: 8313556: Create implementation of NSAccessibilitySlider protocol [v7]

[Alexander Zuev]

> Create implementation for Slider and Stepper accessibility protocols.
> Fix mapping.
> Fix performAction parameter type in declaration.

Alexander Zuev has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 14 commits:

 - Add accessibilityTitleUIElement function to the base class.
 - Merge branch 'master' into JDK-8313556
 - Merge pull request #13 from openjdk/master
   
   Merge
 - Merge pull request #12 from openjdk/master
   
   Merge
 - Merge pull request #11 from openjdk/master
   
   Merge
 - Merge pull request #10 from openjdk/master
   
   Merge
 - Adding accessibilityMinValue and accessibilityMaxValue
 - Merge remote-tracking branch 'origin/master' into JDK-8313556
 - Merge pull request #7 from openjdk/master
   
   Merge
 - - Added accessibilityTitle method
   - Removed some debug output generation
 - ... and 4 more: https://git.openjdk.org/jfx/compare/7a7854c9...09f68099

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Changes: https://git.openjdk.org/jfx/pull/1226/files
  Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=1226&range=06
  Stats: 277 lines in 6 files changed: 276 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jfx/pull/1226.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1226/head:pull/1226

PR: https://git.openjdk.org/jfx/pull/1226