simplify xmlApi registration

alib2common/src/container/Container.cpp

alib2common/src/core/xmlApi.hpp

alib2common/src/object/Object.cpp

alib2common/src/primitive/Primitive.cpp

alib2data/src/alphabet/Symbol.cpp

alib2data/src/automaton/Automaton.cpp

alib2data/src/grammar/Grammar.cpp

alib2data/src/label/Label.cpp

alib2data/src/regexp/RegExp.cpp

alib2data/src/rte/RTE.cpp

alib2data/src/string/String.cpp

alib2data/src/tree/RankedTreeWrapper.cpp

alib2data/src/tree/Tree.cpp

alib2data/src/tree/UnrankedTreeWrapper.cpp

alib2data_experimental/src/graph/Graph.cpp