change BodyTypeTuple of Union to variadic template

src/pe/Types.h

src/pe/communication/DynamicMarshalling.h

src/pe/communication/rigidbody/Union.h

src/pe/fcd/AnalyticCollisionDetection.h

src/pe/fcd/GJKEPACollideFunctor.h

src/pe/fcd/SimpleFCD.h

src/pe/raytracing/Intersects.h

src/pe/rigidbody/RigidBody.h

src/pe/rigidbody/Union.h

src/pe/rigidbody/UnionFactory.h

src/pe/vtk/SphereVtkOutput.cpp

tests/mesh/MeshMarshalling.cpp

tests/pe/Collision.cpp

tests/pe/CollisionTobiasGJK.cpp

tests/pe/Marshalling.cpp

tests/pe/PeDocumentationSnippets.cpp

tests/pe/SetBodyTypeIDs.cpp

tests/pe/ShadowCopy.cpp

tests/pe/Union.cpp