ENH: Remove the now redundant DefaultSimulator class.

Devices/VRPNDeviceClient.h

Devices/VRPNForceDevice.cpp

Examples/FEMSimulator/main.cpp

Examples/LaparoscopicCamera/main.cpp

Rendering/UnitTests/CMakeLists.txt

Rendering/VTKViewer.cpp

SceneModels/DeformableSceneObject.cpp

SceneModels/DeformableSceneObject.h

SceneModels/UnitTests/VegaFEMDeformableSceneObjectSpec.cpp

SceneModels/VegaFEMDeformableSceneObject.cpp

SimulationManager/CMakeLists.txt

Simulators/DefaultSimulator.cpp

Simulators/DefaultSimulator.h

TimeIntegrators/OdeSystem.cpp