bufixes for aux lexemes + generating prelude

 - text/lexemes are stored in std::list now for auxiliary
   lexemes, so we don't lulz ourselves with memory.
 - prelude is now generated in syntactic_analysis_t
 - fixup for initilization of lexeme2_ in parseme_t
 - fixup for children_t trying to use owner_->shared_from_this(),
   when owner_ is null. it doesn't do this anymore.