Create Argument Class [id=66298]

Implemented the class in a new file: pacsudoku.py
Created new unittest file: test_pacsudoku.py
Created a config file for coverage: .coveragerc
Updated main: Add first implementation of console and gui class for
interface, to use for testing calling them since the argument script.
Updated test_main: added tests for the now implemented backtracking and
xalgorithm calling since main.