move type traits extensions to namespace ext

alib2common/src/common/createUnique.hpp

alib2common/src/core/components.hpp

alib2common/src/core/multipleDispatch.hpp

alib2common/src/registration/AlgoRegistration.hpp

alib2std/src/extensions/clone.hpp

alib2std/src/extensions/type_traits.hpp

alib2std/src/extensions/utility.hpp

alib2std/src/extensions/variant.hpp

alib2std/test-src/extensions/TypeTraitsTest.cpp