Mock boards from strings

Created a class that mocks up boards from strings describing a state. This to be able to mock complex boards in a clean and simple way.

This method of mocking was mentioned in class and I thought about doing it in the first sprint, but never got around to do it then.

It is compatible of translating the boards that are printed out by our ASCII game class to board mocks, which can be good when hitting a problem with a certain state.