ECMAScript 6, additional change to improve the "syntax highlighting" (based on 1574)

[speckyspooky]

The "syntax highlighting" becomes an improvement in addition to the change of #1574.
So the editor screen of JavaScript will get additional commant for the highlighting
and also the listed JavaScript-functions at the script-builder will be changed to list more available functions.

The new option of String-multiline will be marked like the current strings "blue" colored.

The following new key words will be highlighted:

• of
• Packages
• importPackage

The following functions will be highlighted (ROM will be changed):

• Array | includes(searchvalue)
• Array | includes(searchvalue, start)
• String | at(index)
• String | codePointAt(position)
• String | includes(searchvalue)
• String | endsWith(value)
• String | startsWith(value)
• String | repeat(copies)
• String | replaceAll(RegExp, replacement)
• String | padEnd(length, value)
• String | padStart(length, value)
• String | trim()
• String | trimEnd()
• String | trimStart()

Example screen of the changes:

[speckyspooky]

The change #1685 is merged to the BIRT-master.