Fix bug in debugtriangleRenderdelegate where the data was not marked as 'unmodified' after an update

Add the start and end events to the simulation manager

See merge request iMSTK/iMSTK!533

BUG: Viewers shouldn't be pausable by scene controller

See merge request iMSTK/iMSTK!532

BUG: Resolve a retain cycle in KeyboardSceneControl

See merge request iMSTK/iMSTK!531

Allow the mousescenecontrol to be turned on and off

See merge request iMSTK/iMSTK!530

ENH: RigidBodyController force smoothening, Lazy VisualModels for LevelSet-RigidInteractionExample

See merge request iMSTK/iMSTK!529

ENH: IO Improvements

See merge request iMSTK/iMSTK!528

ENH: Bounding boxes added for a number of primitives, bug fixes, improvements

See merge request iMSTK/iMSTK!525

REFAC: Laprascopic controller now uses transforms instead of TRS

See merge request iMSTK/iMSTK!524

BUG: Transforms fix

See merge request iMSTK/iMSTK!523

# Conflicts:
#   Examples/GeometryTransforms/GeometryTransformsExample.cpp
#   Source/Rendering/VTKRenderer/RenderDelegate/imstkVTKCylinderRenderDelegate.cpp

ENH: ModuleDrivers, Modules added. Geometry transforms. Multi viewer support....

See merge request iMSTK/iMSTK!522

ENH/BUG: VisualObjectImporter uses Geometry transforms now, debug camera now uses scene bounding box for initialization, SDF haptics example, LevelSet cutting example updated with haptics, external data added, VRPN uncommented but still not functional

ENH: ModuleDrivers, Modules added. Geometry transforms. Multi viewer support. LevelSetModel, LevelSetCH, EventObject, DataArray, Controller, VisualObjectImporter improvements/changes

BUG:imstk cylinder

See merge request iMSTK/iMSTK!517