preparation for terminal and nonterminal types in grammars

alib2algo/src/grammar/generate/GenerateUpToLength.h

alib2algo/src/grammar/properties/NonterminalUnitRuleCycle.h

alib2algo/src/grammar/properties/NullableNonterminals.h

alib2algo/src/grammar/properties/ProductiveNonterminals.h

alib2algo/src/grammar/properties/RecursiveNonterminal.h

alib2algo/src/grammar/properties/UnreachableSymbols.cpp

alib2algo/src/grammar/properties/UnreachableSymbols.h

alib2algo/src/grammar/simplify/EpsilonRemover.h

alib2algo/src/grammar/simplify/UnproductiveSymbolsRemover.h

alib2algo/src/grammar/simplify/UnreachableSymbolsRemover.h

...o_experimental/src/grammar/parsing/CornerSubstitution.cpp

...erimental/src/grammar/parsing/DeterministicLL1Grammar.cpp

..._experimental/src/grammar/parsing/ExtractRightContext.cpp

alib2algo_experimental/src/grammar/parsing/First.cpp

alib2algo_experimental/src/grammar/parsing/First.h

alib2algo_experimental/src/grammar/parsing/Follow.h

...rimental/src/grammar/parsing/HandleFirstFirstConflict.cpp

...perimental/src/grammar/parsing/HandleFirstFirstConflict.h

...imental/src/grammar/parsing/HandleFirstFollowConflict.cpp

...erimental/src/grammar/parsing/HandleFirstFollowConflict.h