Improve greatly treatment of lists that contain tuples

src/language/PEGGrammar.hpp

src/language/ast/ASTBuilder.cpp

src/language/ast/ASTNodeDataTypeBuilder.cpp

src/language/ast/ASTNodeExpressionBuilder.cpp

src/language/ast/ASTNodeListAffectationExpressionBuilder.cpp

src/language/node_processor/AffectationProcessor.hpp

src/language/node_processor/InnerListToVectorProcessor.hpp

src/language/node_processor/TupleToVectorProcessor.hpp

tests/test_ASTBuilder.cpp

tests/test_ASTNodeBuiltinFunctionExpressionBuilder.cpp

tests/test_ASTNodeListAffectationExpressionBuilder.cpp

tests/test_AffectationToStringProcessor.cpp