Moving forms to Forms directory.
Adding Stack class.
Moving and improving Stack.
Fixing problems with Stack.
Adding Interpreter along with required components.
Turning Interpreter into a static class.
Adding parsing and serializing functionality.
Adding MathUtility class.
Adding conditional operators.
Removing GetPi and GetE operators.
Adding ClearStack operation and renaming Clear operation into ClearAccumulator.
Removing parameterless constructor.
Adding ResetIndex operation.
Refactoring index operations.