Feature request: conversion of TypeScript type declarations into Ceylon dynamic interface type declaration

[lukehutch]

Type declarations have been compiled for a large number of Javascript interfaces here:

https://github.com/borisyankov/DefinitelyTyped

It would be really useful for Ceylon to support the TypeScript type definition syntax, either for conversion into a dynamic interface definition, or (better) so that this type information can be used directly without conversion.

[quintesse]

There was an earlier feature request for this some time ago: #217 but seemingly it was closed because other features made it unnecessary for the person who opened it.

But we still want some kind of TypeScript support, so it's good to again have an issue tracking that intention.

[lukehutch]

TSD has been deprecated in favor of Typings:

DefinitelyTyped/tsd#269
https://github.com/typings/typings