<AWT Dev> RFR: 8265445: Introduce the new client property for mac: apple.awt.windowAppearance

[Alexey Ushakov]

Implemented apple.awt.windowAppearance client property

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Commit messages:
 - 8265445: Introduce the new client property for mac: apple.awt.windowAppearance

Changes: https://git.openjdk.java.net/jdk/pull/3583/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=3583&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8265445
  Stats: 188 lines in 3 files changed: 188 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3583.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3583/head:pull/3583

PR: https://git.openjdk.java.net/jdk/pull/3583