A convenient handler for the output of a createProcess call. This data containes 4 components:

1. a handle to stdin if it was requested
2. a handle to stdout if it was requested
3. a handle to stderr if it was requested
4. a process handle, containing a pid lock, information regarding ctcl-c delegation, and closed/open handle status info.

An iso between the ProcessHandler data and its product representation

A lens into the stdin handle if requested

A lens into the stdout handle if requested

A lens into the stderr handle if requested

A lens into the process handle

A default for a CreateProcess