DeformableCollisionRepresentation loads file in 'doInitialize()' call

DeformableCollisionRepresentation will initialize the Meshahpe it owns
by passing a ApplicationData.
Revise Fem3DRepresentation::doInitialize() function

Log if empty file name is given or the given file name can not be found.
If owns a MeshShape, RigidRepresentation will try to initialize it.

RigidRepresentation will check to see if it owns a MeshShape in
RigidRepresentationParameters. If it does, it will initialize the
MeshShape by passing an ApplicationData and then update
'ShapeUsedForMassInertia' in RigidRepresentationParameters.
Update/clean up StaplingDemo main function
Fix UnitTest failure of DeformableCollisionRepresentation on Linux