Punctuation handling in bspMorphRetriever

This is a reference PR and will be immediately closed - we don't need this code right now, but might do at some point.

The morphology service doesn't handle punctuation - a while ago we added custom handling of them in the `bspMorphRetriever`. However, at this point the templating process in Perseus analyses them already, so we don't really have a need for it right now (mind that there is a slight issue left with that - PerseusDL/perseids_docs#194)