[utils] unify file and namespace names: *Utils -> *Util ()

Base/Py/PyFmt.cpp

Base/Py/PyUtil.cpp

Base/Py/PyUtil.h

Base/Util/FileSystemUtil.cpp

Base/Util/FileSystemUtil.h

Base/Util/StringUtil.cpp

Base/Util/StringUtil.h

Base/Util/SysUtil.cpp

Base/Util/SysUtil.h

Device/Data/ArrayUtil.cpp

Device/Data/ArrayUtil.h

Device/Data/DataUtil.cpp

Device/Data/DataUtil.h

Device/IO/DataFormatUtil.cpp

Device/IO/DataFormatUtil.h

Device/IO/IOFactory.cpp

Device/IO/ReadReflectometry.cpp

Device/IO/ReadWriteINT.cpp

Device/IO/ReadWriteNicos.cpp

Device/IO/ReadWriteNumpyTXT.cpp