RFR: 8290473: update Eclipse .classpath in apps, buildSrc

[Andy Goryachev]

- updated .classpath entries in apps/
- added utf-8 prefs in .settings/

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Commit messages:
 - 8290473: added ColorCube project
 - 8290473: eclipse config for apps

Changes: https://git.openjdk.org/jfx/pull/858/files
 Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=858&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8290473
  Stats: 97 lines in 12 files changed: 55 ins; 8 del; 34 mod
  Patch: https://git.openjdk.org/jfx/pull/858.diff
  Fetch: git fetch https://git.openjdk.org/jfx pull/858/head:pull/858

PR: https://git.openjdk.org/jfx/pull/858