data: rename WildcardSymbol -> Wildcard

...o/src/arbology/exact/ExactNonlinearTreePatternAutomaton.h

alib2algo/src/arbology/exact/ExactTreePatternAutomaton.h

alib2algo/src/tree/generate/RandomTreeFactory.cpp

alib2data/src/alphabet/Wildcard.cpp

alib2data/src/alphabet/Wildcard.h

alib2data/src/alphabet/xml/Wildcard.cpp

alib2data/src/alphabet/xml/Wildcard.h

alib2data/src/string/WildcardLinearString.h

alib2data/src/tree/ranked/PrefixRankedBarNonlinearPattern.h

alib2data/src/tree/ranked/PrefixRankedBarPattern.h

alib2data/src/tree/ranked/PrefixRankedExtendedPattern.h

alib2data/src/tree/ranked/PrefixRankedNonlinearPattern.h

alib2data/src/tree/ranked/PrefixRankedPattern.h

alib2data/test-src/tree/PatternTest.cpp

alib2data/test-src/tree/TreeTest.cpp

alib2str/src/alphabet/string/Wildcard.cpp

alib2str/src/alphabet/string/Wildcard.h

alib2str/src/tree/string/common/TreeFromStringParserCommon.h

alib2str/src/tree/string/ranked/RankedExtendedPattern.h

alib2str/src/tree/string/ranked/RankedNonlinearPattern.h