namespace-qualified property names in object initializers

[dherman]

Allow object initializers to namespace-qualify their properties.

Example:

public var dict = {
    ns::a: 1,
    ns::"@b": 2,
    toString: function() "<<dict>>"
}

This uses the syntax of namespace-qualified constant names (see #30)

[ibukanov]

If es4 allows

obj = { ns::"str": 1 },

should we also allow

obj.ns::"str"

and even

obj."str" ?

Similarly, for the symmetry with

obj = { 1: "text" },

what about

obj = { ns::1: "text"}; obj.ns::1 = "text"; obj.1 = "text"

That is, the idea here is to allow in name.<property> and in name.ns::<property> for <property> to be anything that is allowed in the object initializer as a property name.

[jeffdyer]

I second this proposal, including Igor's extended name syntax.

Hearing no objections...I say it's accepted.