API for running native commands in a child process. Clients simply create `Process`es using the `createProcess()` method. The new process starts executing immediately. Process process = createProcess { command = "ls"; arguments = ["-l"]; path = home; }; By default, the standard input, output, and error streams of the new child process are piped to and from the current process by exposing a `Writer` and `Reader`s. if (is Reader reader = ...