Refactor llprocesslauncher_test.cpp for better code reuse.

Instead of free python() and python_out() functions containing a local
temporary LLProcessLauncher instance, with a 'tweak' callback param to
"do stuff" to that inaccessible object, change to a PythonProcessLauncher
class that sets up a (public) LLProcessLauncher member, then allows you to
run() or run() and then readfile() the output. Now you can construct an
instance and tweak to your heart's content -- without funky callback syntax --
before running the script.
Move all such helpers from TUT fixture struct to namespace scope. While
fixture-struct methods can freely call one another, introducing a nested class
gets awkward: constructor must explicitly require and bind a fixture-struct
pointer or reference. Namespace scope solves this.
(Truthfully, I only put them in the fixture struct originally because I
thought it necessary for calling ensure() et al. But ensure() and friends are
free functions; need only qualify them with tut:: namespace.)

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