RFR: 8336031: Create implementation of NSAccessibilityStaticText protocol

[Alexander Zuev]

Initial implementation of the protocol.

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Commit messages:
 - 8336031: Create implementation of NSAccessibilityStaticText protocol

Changes: https://git.openjdk.org/jfx/pull/1507/files
  Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=1507&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8336031
  Stats: 112 lines in 3 files changed: 110 ins; 0 del; 2 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