RFR: 8290473: update Eclipse .classpath in apps, buildSrc [v9]

[Andy Goryachev]

> The goal of this change is to make sure jfx repo can be imported as a gradle project in eclipse and all nested projects in the workspace compile with no errors.
> 
> - updated .classpath entries in apps/
> - added utf-8 prefs in .settings/

Andy Goryachev has updated the pull request incrementally with one additional commit since the last revision:

  8290473: removed empty src sir

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

Changes:
  - all: https://git.openjdk.org/jfx/pull/858/files
  - new: https://git.openjdk.org/jfx/pull/858/files/791552c0..2a9fb3b7

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jfx&pr=858&range=08
 - incr: https://webrevs.openjdk.org/?repo=jfx&pr=858&range=07-08

  Stats: 2 lines in 1 file changed: 0 ins; 2 del; 0 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