RFR: 8313424: JavaFX controls in the title bar [v69]

[Michael Strauß]

> Implementation of [`StageStyle.EXTENDED`](https://gist.github.com/mstr2/0befc541ee7297b6db2865cc5e4dbd09).

Michael Strauß has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 89 commits:

 - Merge branch 'master' into feature/extended-window
 - doc change
 - add HeaderDragType
 - add MenuBar to stage tester
 - documentation
 - review comments
 - Merge branch 'master' into feature/extended-window
 - documentation
 - don't show a right-click system menu in full-screen mode
 - Merge branch 'master' into feature/extended-window
 - ... and 79 more: https://git.openjdk.org/jfx/compare/3fdd2138...6a2f05d6

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Changes: https://git.openjdk.org/jfx/pull/1605/files
  Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=1605&range=68
  Stats: 6768 lines in 76 files changed: 6086 ins; 505 del; 177 mod
  Patch: https://git.openjdk.org/jfx/pull/1605.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1605/head:pull/1605

PR: https://git.openjdk.org/jfx/pull/1605