RFR: 8238080: FXMLLoader: if script engines implement javax.script.Compilable compile scripts

[Rony G.Flatscher]

TODO: ADD DESCRIPTION OF PROPOSED FIX HERE.

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Commit messages:
 - Correct error constant.
 - appease the jcheck script, such that that important trailing Whitespace error can be resolved (why would jcheck not do it automagically as well as expanding tabs?)
 - Merge master, correct ovesights.
 - Merge master
 - JDK-8238080 : FXMLLoader: if script engines implement javax.script.Compilable compile scripts
 - corrected wrong test string
 - Removed executable bit from gradlew as this causes an error when
 - Merge branch 'scripttest' into script as requested by reviewer Kevin
 - Incorporating Kevin Rushfort's review comments to this WIP.
 - Incorporating Kevin Rushfort's review comments to this WIP.
 - Removed/replaced white space.
 - Removed/replaced white space.
 - test for <https://bugs.openjdk.java.net/browse/JDK-8234959> JDK-8234959: FXMLLoader does not populate ENGINE_SCOPE Bindings with FILENAME and ARGV
 - fix for <https://bugs.openjdk.java.net/browse/JDK-8234959> JDK-8234959: FXMLLoader does not populate ENGINE_SCOPE Bindings with FILENAME and ARGV

Changes: https://git.openjdk.java.net/jfx/pull/129/files
 Webrev: https://webrevs.openjdk.java.net/jfx/129/webrev.00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8238080
  Stats: 1003 lines in 17 files changed: 996 ins; 1 del; 6 mod
  Patch: https://git.openjdk.java.net/jfx/pull/129.diff
  Fetch: git fetch https://git.openjdk.java.net/jfx pull/129/head:pull/129

PR: https://git.openjdk.java.net/jfx/pull/129