REFAC: Rewrite all template classes to use Real as type aliasing

Examples/SPHFluid/Fluid.cpp

Examples/SPHFluid/Main.cpp

Examples/TestNeighborSearch/TestNeighborSearch.cpp

...ce/Collision/CollisionHandling/imstkCollisionHandling.cpp

...Collision/CollisionHandling/imstkSPHCollisionHandling.cpp

...e/Collision/CollisionHandling/imstkSPHCollisionHandling.h

Source/Core/imstkMath.h

Source/DataStructures/Testing/imstkNeighborSearchTest.cpp

Source/DataStructures/imstkGridBasedNeighborSearch.cpp

Source/DataStructures/imstkGridBasedNeighborSearch.h

Source/DataStructures/imstkUniformSpatialGrid.cpp

Source/DataStructures/imstkUniformSpatialGrid.h

Source/DynamicalModels/ObjectModels/imstkSPHKernels.h

Source/DynamicalModels/ObjectModels/imstkSPHModel.cpp

Source/DynamicalModels/ObjectModels/imstkSPHModel.h

Source/DynamicalModels/ObjectStates/imstkSPHState.cpp

Source/DynamicalModels/ObjectStates/imstkSPHState.h

Source/SceneElements/Objects/imstkSPHObject.cpp

Source/SceneElements/Objects/imstkSPHObject.h

Source/Solvers/imstkSPHSolver.cpp