Added CalculateStatistics logic
Rather large commit. Most important changes:

1. Added statistics array for Squared Difference, Jacobian and Inverse Consistency (instead of different doubles for mean, std, max...).
2. Included statistics function in logic, which calculates statistics of an image.
3. Added inverse consistency changes to UI (new vector field input and inverse consistency box).
4. Added inverse consistency logic.
5. Commented all the things in Node, that don't require input from user (statistics, chekerboard/jacobian.. volume, flickeropacity...)
Changed color to red for inverse consistency