Split out the code to prepare the simulator from the AppRunner class,
which is now just handling the logic required for each test run.
This way it's easier to handle simulator preparation for multiple
test runs with the same simulator.
Also revamp logging to avoid printing directly to the console, but
instead use the logging classes that permit redirecting logging
to a file. This makes the html report show better logging.
* [xharness] Log simulator loading and handle any exceptions.
* [xharness] Add missing tests.
* [xharness] Throw a helpful exception instead of NRE when a simulator can't be found.
* [xharness] Fix null reference exception.
Rolf Bjarne Kvinge