Improve JavaScript support in QML with property var syntax

This task contains information about the outstanding JavaScript improvements which will be made to QtQuick 2 relating to the proposed "property var" syntax. Such properties store v8 handles directly, thereby reducing the amount of conversion which must take place when using properties from JS in C++ and vice versa. They will behave identically to JavaScript vars in all respects otherwise.

Previous Work:

• Implementations for the feature have been written and ported to V8/QtQuick2.
• Unit tests have been written.
• Documentation has been written.
• Initial code reviews have been performed.

Outstanding Work:

• Final code review
• Examples

Current Status:

Awaiting final review of code and unit tests, before writing examples.