RFR: 8345348: CSS media feature queries [v21]

[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 30 commits:

 - Merge branch 'master' into feature/media-queries
 - cssref doc
 - Merge branch 'master' into feature/media-queries
 - reorder fields
 - remove ReadOnlyBooleanWrapper
 - Scene preferences only actively observe platform preferences when the scene is showing
 - formatting
 - typo
 - use equality instead of identity
 - rename TokenStream methods
 - ... and 20 more: https://git.openjdk.org/jfx/compare/498b7e4c...626a904d

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Changes: https://git.openjdk.org/jfx/pull/1655/files
  Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=1655&range=20
  Stats: 5139 lines in 41 files changed: 3987 ins; 1050 del; 102 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