Rendering problems for large simulations

[asymingt]

The rendering method consumes significant computational resources. For example, the main10.m example does not run in real-time on a Core i7 laptop, and the visualisation is not rendered. Adding ‘drawnow’ calls at end of control loop forces rendering for problems where the simulation-time is longer than real-time. We should also measure how the run-time complexity of the simulator changes as subsequent platforms are added.