RFR: 8313424: JavaFX controls in the title bar [v29]

[Michael Strauß]

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

Michael Strauß has updated the pull request incrementally with one additional commit since the last revision:

  macOS: double-click action + fullscreen toolbar

-------------

Changes:
  - all: https://git.openjdk.org/jfx/pull/1605/files
  - new: https://git.openjdk.org/jfx/pull/1605/files/26b81b85..003e9d56

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jfx&pr=1605&range=28
 - incr: https://webrevs.openjdk.org/?repo=jfx&pr=1605&range=27-28

  Stats: 41 lines in 4 files changed: 37 ins; 2 del; 2 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