RFR: 8289255: update Eclipse .classpath and other configuration files

[Andy Goryachev]

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

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Commit messages:
 - Revert "8279297: removed unused Shape.setMode method"
 - 8279297: removed unused Shape.setMode method
 - 8289255: reverted gradlew
 - 8289255: reverted gradlew
 - 8289255: remove executable flag
 - 8289255: updated eclipse .classpath and other configuration files

Changes: https://git.openjdk.org/jfx/pull/804/files
 Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=804&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8289255
  Stats: 99 lines in 7 files changed: 52 ins; 20 del; 27 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