RFR: 8358450: Viewport characteristics media features [v2]

[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)

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

  Replace context awareness flags with EnumSet

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Changes:
  - all: https://git.openjdk.org/jfx/pull/1844/files
  - new: https://git.openjdk.org/jfx/pull/1844/files/abdccad9..cc0d44c1

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jfx&pr=1844&range=01
 - incr: https://webrevs.openjdk.org/?repo=jfx&pr=1844&range=00-01

  Stats: 191 lines in 16 files changed: 102 ins; 34 del; 55 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