RFR: 8336031: Create implementation of NSAccessibilityStaticText protocol [v4]

[Alexander Zuev]

> Initial implementation of the protocol.

Alexander Zuev has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains five additional commits since the last revision:

 - Merge branch 'master' into JDK-8336031
 - Merge pull request #10 from openjdk/master
   
   Merge
 - Removing methods that supposed to generate attributed strings. String attributes are not available for the static text elements and cause exceptions to be thrown when requested.
 - Add comment about AccessibleRole enuM
 - 8336031: Create implementation of NSAccessibilityStaticText protocol
   
   Initial implementation of the protocol.

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Changes:
  - all: https://git.openjdk.org/jfx/pull/1507/files
  - new: https://git.openjdk.org/jfx/pull/1507/files/aeedf36f..57ab4a50

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jfx&pr=1507&range=03
 - incr: https://webrevs.openjdk.org/?repo=jfx&pr=1507&range=02-03

  Stats: 435256 lines in 9199 files changed: 230150 ins; 122468 del; 82638 mod
  Patch: https://git.openjdk.org/jfx/pull/1507.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1507/head:pull/1507

PR: https://git.openjdk.org/jfx/pull/1507