Additional configuration options when launching webservers

[istathar]

There are a few important configuration fields that are, at present, not exposed by launchWebserver. Two that have come to notice are

• address
• timeout

There are useful default values there now, so this isn't urgent, but something to think about. Perhaps we could call it launchWebserver'.

[istathar]

We probably also need a way to pass in a TLS certificate keypair if we want to terminate secure connections.