changed shared_ptr to unique_ptr for creators

src/amdis/AdaptInfo.hpp

src/amdis/CreatorInterface.hpp

src/amdis/LocalAssemblerBase.hpp

src/amdis/QuadratureFactory.hpp

src/amdis/io/FileWriterInterface.hpp

src/amdis/linear_algebra/LinearSolver.hpp

src/amdis/linear_algebra/eigen/SolverCreator.hpp

src/amdis/linear_algebra/istl/ISTL_Preconditioner.hpp

src/amdis/linear_algebra/mtl/Preconditioner.hpp