RFR: 8349373: Support JavaFX preview features

Tue Feb 4 16:07:26 UTC 2025

This PR contains a definition of preview features for JavaFX, as well as a helper class to verify that an application has opted into preview features.

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Commit messages:
 - Use enum constants instead of feature names
 - Merge branch 'master' into feature/previewfeature
 - Preview features

Changes: https://git.openjdk.org/jfx/pull/1359/files
  Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=1359&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8349373
  Stats: 124 lines in 2 files changed: 124 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jfx/pull/1359.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1359/head:pull/1359

PR: https://git.openjdk.org/jfx/pull/1359