More marking sheet improvements

The marking sheet printouts now support all available sections, adding Gaits, Jumping and Exterior which were previously unsupported. These will be rendered in the same way as Assessments, but separately.

Screenshot 2020-09-15 at 13.22.06.png

The marking sheets now also respect the selected Score method, so the printouts no longer state for example "Total score in %:" when the score method is set to Points.

Screenshot 2020-09-15 at 13.31.18.png