Ability to set custom name for the server

[bobi6666]

There should be a method, when spawning an IPC server, that lets you pass in your own name. There should be another method that checks if a given name is already used, which I believe your one-shot function uses internally to generate random names until it comes up with one that's free. We have run into a use case where it would be much more preferable to have the server process passed the name of the pipe to use on its command line, rather than have to somehow communicate back to the client what its name should be before actual IPC is established.