Align with the Orthogonal Classes framework

[erights]

https://github.com/erights/Orthogonal-Classes

In this syntactic framework, public properties would be declared as

class Foo {
    own bar = 3, baz = 4;
    // ...
}

This declares and initializes a public instance properties named "bar" and "baz". See https://github.com/erights/Orthogonal-Classes for details and rationale.

[erights]

attn @allenwb @jeffmo