RFR: 8313424: JavaFX controls in the title bar [v60]

[Michael Strauß]

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

Michael Strauß has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 77 commits:

 - doc update
 - Merge branch 'master' into feature/extended-window
   
   # Conflicts:
   #	tests/manual/monkey/src/com/oracle/tools/fx/monkey/MainWindow.java
   #	tests/manual/monkey/src/com/oracle/tools/fx/monkey/tools/ModalWindow.java
 - documentation
 - documentation
 - tweak header button scaling at 100%
 - enable preview features in tests
 - add preview feature
 - add preview feature
 - Merge branch 'master' into feature/extended-window
 - tweak header button glyph scaling
 - ... and 67 more: https://git.openjdk.org/jfx/compare/f31d00d8...88e50163

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Changes: https://git.openjdk.org/jfx/pull/1605/files
  Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=1605&range=59
  Stats: 6529 lines in 75 files changed: 5848 ins; 501 del; 180 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