isspace instead of space characters explicit list

alib2str/src/automaton/AutomatonFromStringLexer.cpp

alib2str/src/container/ContainerFromStringLexer.cpp

alib2str/src/grammar/GrammarFromStringLexer.cpp

alib2str/src/primitive/PrimitiveFromStringLexer.cpp

alib2str/src/regexp/RegExpFromStringLexer.cpp

alib2str/src/string/StringFromStringLexer.cpp

alib2str/src/tree/TreeFromStringLexer.cpp