RFR: 8345348: CSS Media Queries [v2]

[Michael Strauß]

> Implementation of [CSS media queries](https://gist.github.com/mstr2/cbb93bff03e073ec0c32aac317b22de7).

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

 - revert
 - remove SceneMediaQueryContext
 - adjust copyright year
 - Merge branch 'master' into feature/media-queries
   
   # Conflicts:
   #	modules/javafx.graphics/src/main/java/com/sun/javafx/scene/SceneHelper.java
   #	modules/javafx.graphics/src/main/java/javafx/scene/Scene.java
   #	modules/javafx.graphics/src/test/java/test/javafx/css/StylesheetTest.java
 - Add persistentScrollBars media feature
 - Merge branch 'master' into feature/media-queries
   
   # Conflicts:
   #	modules/javafx.graphics/src/main/java/com/sun/javafx/application/preferences/PlatformPreferences.java
 - Merge branch 'master' into feature/media-queries
 - Implementation of media queries

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Changes: https://git.openjdk.org/jfx/pull/1655/files
  Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=1655&range=01
  Stats: 4537 lines in 35 files changed: 3436 ins; 1026 del; 75 mod
  Patch: https://git.openjdk.org/jfx/pull/1655.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1655/head:pull/1655

PR: https://git.openjdk.org/jfx/pull/1655