Support ECMAScript 6

[rbeckman-nextgen]

We should add an option to mirth.properties to set the Rhino language version, like we do for the optimization level. \ \

• rhino.languageversion

Also should update Rhino to the latest version.

Debatable whether we want to enable ES6 by default, will have to test things like E4X to ensure nothing is going to break

---

Possible values:

• default
• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5
• 1.6
• 1.7
• 1.8
• es6

For new installations the property will be set to ES6. For upgraded installations the property will be set to default so that no behavior changes.

Imported Issue. Original Details: Jira Issue Key: MIRTH-4285 Reporter: narupley Created: 2018-05-30T11:43:25.000-0700