RFR: 8358450: Viewport characteristics media features

[Michael Strauß]

Implementation of [viewport characteristics media features](https://www.w3.org/TR/mediaqueries-5/#mf-viewport-characteristics):
* `width`
* `height`
* `aspect-ratio`: width / height
* `orientation`: `portrait`, `landscape`
* `display-mode`: `fullscreen`, `standalone` (note: `browser` and `minimal-ui` are not supported in JavaFX)

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Commit messages:
 - Add viewport characteristics media features

Changes: https://git.openjdk.org/jfx/pull/1844/files
  Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=1844&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8358450
  Stats: 2424 lines in 37 files changed: 1909 ins; 202 del; 313 mod
  Patch: https://git.openjdk.org/jfx/pull/1844.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1844/head:pull/1844

PR: https://git.openjdk.org/jfx/pull/1844