so that we can change them for integration tests via the new ModularMailboxModule that now also includes the UrlProvider

On Windows, RunAsDaemon is a no-op so we need to read stdout to find out when Tor has finished starting up, then continue to read and discard stdout until Tor exits.

This may avoid problems with ClassImposteriser when using Java 11. See
https://github.com/jmock-developers/jmock-library/releases/tag/2.10.0

Instead of using hard-coded values 59050 and 59051 for the Tor socks and
control ports, provide them via a TorPorts interface. This makes it possible
to pass the ports to a TorPortsImpl in modules. Hence it is possible to
configure the Tor port for different types of builds or via command line
options in case of briar headless or other clients using the core code.