RFR: 8345348: CSS media feature queries [v13]

[Michael Strauß]

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

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

  improved implementation of NullCoalescingPropertyBase

-------------

Changes:
  - all: https://git.openjdk.org/jfx/pull/1655/files
  - new: https://git.openjdk.org/jfx/pull/1655/files/51d26f71..b5bfc603

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jfx&pr=1655&range=12
 - incr: https://webrevs.openjdk.org/?repo=jfx&pr=1655&range=11-12

  Stats: 87 lines in 3 files changed: 72 ins; 2 del; 13 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