Property order is not preserved with TypeScript input

[dvdsgl]

Given TypeScript input (share link):

class A {
    name: string;
    age: number;
}

I get the following output in Swift:

struct A {
    let age: Double
    let name: String
}

This is undesirable for a few reasons, the major reason is that A has a default initializer A(age: _, name: _) that contradicts the TypeScript property order.

[schani]

This depends on #336 and might also require modifying typescript-json-schema.