Made Fanorona implement Evaluatable

Made Fanorona class an implementation of the Evaluatable interface.
Also added the methods of the Evaluatable interface (to be implemented) to the class.

Removed import from Main.java that was creating a warning.
Added very basic .evaluate()

Added simple implementation of the evaluate method for Fanorona.
It just returns the white peices less the number of black pieces.

Closed the Scanners in Main to remove two more warnings.
Variable name refactoring

Refactored the names of the variables in Main to be more clear as to what they are.

Changed the output of the catch block in Main to be the contents of the error message.