[jfx17] RFR: 8212088: Missing copyright notices for property files

[Kevin Rushforth]

This PR adds missing copyright header blocks for several properties files, script files, and textual data files (e.g., fxml, css) that do not have them. Where feasible, all non-trivial textual files in the repo should have a proper copyright header.

## Notes to Reviewers

* This PR is targeted to the `jfx17` branch.
* There are two commits that can be reviewed separately, if you  prefer. The first covers most of the files, and adds a copyright header with a GPL v2 + classpath license. The second is for the `apps/samples` only, which adds a copyright header with a BSD-style license.

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Commit messages:
 - 8212088: Missing copyright notices for property files (samples)
 - 8212088: Missing copyright notices for property files

Changes: https://git.openjdk.java.net/jfx/pull/591/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jfx&pr=591&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8212088
  Stats: 1712 lines in 66 files changed: 1702 ins; 0 del; 10 mod
  Patch: https://git.openjdk.java.net/jfx/pull/591.diff
  Fetch: git fetch https://git.openjdk.java.net/jfx pull/591/head:pull/591

PR: https://git.openjdk.java.net/jfx/pull/591