RFR: 8290473: update Eclipse .classpath in apps, buildSrc [v10]

[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 with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains 12 additional commits since the last revision:

 - Merge branch 'openjdk:master' into 8290473.apps
 - 8290473: removed empty src sir
 - 8290473: whitespace
 - 8290473: init shader dirs
 - 8290473: junit 5
 - Merge remote-tracking branch 'origin/master' into 8290473.apps
 - 8290473: removed eclipse project in buildSrc
 - 8290473: whitespace
 - 8290473: added initDirs task
 - Merge remote-tracking branch 'origin/master' into 8290473.apps
 - ... and 2 more: https://git.openjdk.org/jfx/compare/ab2c3638...f3fa2068

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

Changes:
  - all: https://git.openjdk.org/jfx/pull/858/files
  - new: https://git.openjdk.org/jfx/pull/858/files/2a9fb3b7..f3fa2068

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jfx&pr=858&range=09
 - incr: https://webrevs.openjdk.org/?repo=jfx&pr=858&range=08-09

  Stats: 1193 lines in 4 files changed: 964 ins; 189 del; 40 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