RFR: 8309558: Create implementation of NSAccessibilityCheckBox protocol [v3]

[Alexander Zuev]

> also
> 8309629: Create implementation of NSAccessibilityRadioButton protocol
> 
> Create implementation of NSAccessibilityCheckBox and NSAccessibilityRadioButton protocols
> Add workaround for the wrong focus owner announcement with radio buttons
> Add workaround for wrong magnifier text on buttons

Alexander Zuev has updated the pull request incrementally with one additional commit since the last revision:

  Comment out TAB_ITEM until the TAB_GROUP is properly implemented in the new API
  Make isAccessibilityFocused to always return a proper value

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

Changes:
  - all: https://git.openjdk.org/jfx/pull/1184/files
  - new: https://git.openjdk.org/jfx/pull/1184/files/1ce209c1..8a6ad667

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jfx&pr=1184&range=02
 - incr: https://webrevs.openjdk.org/?repo=jfx&pr=1184&range=01-02

  Stats: 4 lines in 1 file changed: 1 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jfx/pull/1184.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1184/head:pull/1184

PR: https://git.openjdk.org/jfx/pull/1184