RFR: 8289255: update Eclipse .classpath and other configuration files [v6]

[Andy Goryachev]

> summary of changes:
> - fixed .classpath files
> - set UTF-8 encoding in the eclipse project config files

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 11 additional commits since the last revision:

 - Merge remote-tracking branch 'origin/master' into JDK-8289255
 - Merge remote-tracking branch 'origin/master' into JDK-8289255
 - 8289255 remove javafx.graphics/build/gensrc as source folder
 - 8289255 remove javafx.swing/src/test/java as source folder
 - Merge remote-tracking branch 'origin/master' into JDK-8289255
 - Revert "8279297: removed unused Shape.setMode method"
   
   This reverts commit 6b3b7e51f168a02f68c3bc0324528164680cb6c9.
 - 8279297: removed unused Shape.setMode method
 - 8289255: reverted gradlew
 - 8289255: reverted gradlew
 - 8289255: remove executable flag
 - ... and 1 more: https://git.openjdk.org/jfx/compare/59d162d2...3a5e2451

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

Changes:
  - all: https://git.openjdk.org/jfx/pull/804/files
  - new: https://git.openjdk.org/jfx/pull/804/files/9d06dc7b..3a5e2451

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jfx&pr=804&range=05
 - incr: https://webrevs.openjdk.org/?repo=jfx&pr=804&range=04-05

  Stats: 16 lines in 2 files changed: 0 ins; 11 del; 5 mod
  Patch: https://git.openjdk.org/jfx/pull/804.diff
  Fetch: git fetch https://git.openjdk.org/jfx pull/804/head:pull/804

PR: https://git.openjdk.org/jfx/pull/804