New structure of biblical references

This MR adjusts the back end to the new encoding of biblical references that also considers (multi line) paraphrases as well as direct quotes.

⚠ This MR introduces a fix of Ahiqar's implementation of the AnnotationAPI. target must hold an array, not a single object. TIDO is currently not able to handle this correction; cf. subugoe/emo/tido#421 (closed).