[jdk11u-dev] RFR: 8256111: Create implementation for NSAccessibilityStaticText protocol

[Autumn Capasso]

Backport [JDK-8256111](https://bugs.openjdk.org/browse/JDK-8256111) clean backport. One of 28 https://bugs.openjdk.org/browse/JDK-8152350

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Commit messages:
 - Backport acbcde8c3c004efe3d95166f471ee77ac8415af7
 - 8256110: Create implementation for NSAccessibilityStepper protocol
 - backport bbb93ca3c80968d4f167bb4cd9e5d3e60e4a6a5b
 - Backport 9d669c912d3977027f321a5e6b7f045ca2ce9482 one of 28. Clean.

Changes: https://git.openjdk.org/jdk11u-dev/pull/1580/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1580&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8256111
  Stats: 519 lines in 12 files changed: 502 ins; 15 del; 2 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/1580.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev pull/1580/head:pull/1580

PR: https://git.openjdk.org/jdk11u-dev/pull/1580