Refactor Command.run(String[])

[jfcameron]

This function default constructs a Parameter.List then configures it by parsing the program's arg list. Since Parameter.List is an abstraction of a program's arg list (partial or full) the work of creating a Parameter.List from a String[] should be done in a ctor, it should not be done externally. additionally, not sure why Parameter.List can be default constructed (what is the meaning of a default constructed Parameter.List? What does such a thing represent?). The work done in this function should be moved to a ctor of Parameter.List:
Parameter.List(String[])