Refactor public API with coroutines and rewrite decryptor

[qnga]

I'm not sure yet in particular about:

• URLPresenter: I can't understand why the dismiss callback is exposed.
• Are LicenseDocument and LicenseStatus intended to be public?

[mickael-menu]

• URLPresenter: I can't understand why the dismiss callback is exposed.

We need to know when the user is done with the HTML renew (through a web view), to call the completion closure provided in renewLoan(). Although we could use a term more idiomatic for Kotlin than dismiss.

• Are LicenseDocument and LicenseStatus intended to be public?

Yes, they hold information about the license.

[qnga]

Ok, so I think the dismiss callback would be useless with the suspend signature.

suspend fun renewLoan(end: DateTime?, urlPresenter: suspend (URL) -> Unit): Try<Unit, LcpException> should be fine.