make base Entry classes public

alib2abstraction/src/registry/AlgorithmRegistry.hpp

alib2abstraction/src/registry/CastRegistry.hpp

alib2abstraction/src/registry/ContainerRegistry.hpp

alib2abstraction/src/registry/ImmediateRegistry.hpp

alib2abstraction/src/registry/NormalizeRegistry.hpp

alib2abstraction/src/registry/ValuePrinterRegistry.hpp

alib2raw/src/registry/RawReaderRegistry.hpp

alib2raw/src/registry/RawWriterRegistry.hpp

alib2str/src/registry/StringWriterRegistry.hpp

alib2xml/src/core/xmlApi.hpp

alib2xml/src/registry/XmlComposerRegistry.hpp

alib2xml/src/registry/XmlContainerParserRegistry.hpp

alib2xml/src/registry/XmlParserRegistry.hpp