Refactor FileWriter and introduce WriterUtilites

src/basics/utilities/UbTuple.h

src/gpu/VirtualFluids_GPU/Output/FileWriter.cpp

src/gpu/VirtualFluids_GPU/Output/FileWriter.h

src/gpu/VirtualFluids_GPU/Output/UnstructuredGridWriter.hpp

src/gpu/VirtualFluids_GPU/Output/WriterUtilities.cpp

src/gpu/VirtualFluids_GPU/Output/WriterUtilities.h

src/gpu/VirtualFluids_GPU/Parameter/Parameter.cpp

src/gpu/VirtualFluids_GPU/Parameter/Parameter.h