Updates affils to allow multiple institutional identifiers per affil

Versions <=v1.0.10 assumed that each affiliation object could have one name (string), one identifier type, and one identifier id. Version 1.0.11 subclasses the affiliation identifier, and each affil object will now have an array of affiliation identifers.

The practical application of this is that if the publisher includes multiple external identifiers for a given author affiliation -- for example an ISNI, ROR, and/or GRID id -- we will be able to store all within the affiliation.

Adds storage for title/subtitle footnotes and other xrefs

• Created a new reference, Title.json, containing the structure of Document.json['title'] with an additional list of strings for notes
• Document "title" and "subtitle" are now both $ref to Title.json

Fielded funding information, capable of holding multiple sources

Merge pull request #19 from seasidesparrow/funding_obj.20230725

fix: update Document.funding to be array of Funder objects

Fix: change key names in Contrib.json

This release modifies key names to replace hyphens with underscores, for compatibility with serialization tools.

Fix: Allowed doctypes now match Solr data types

Updated doctypes to include the entire list of doctypes allowed by Solr. The "data" doctype has been renamed to "dataset".

Modifications to book / book-series handling

• Added space for e-ISBN
• Additional space for book-in-series information

Maintenance release: formatting typo

#10 Fixed formatting typo in PubDates schema

Maintenance release: modified PubDate and relatedTo

Merge pull request #9 from seasidesparrow/main

Changed heirarchy for relatedTo and pubDate.otherDate to be arrays rather than single objects

Maintenance release: setup

#8 Renamed package name in setup to make pip happy

Maintenance release

• Fixed setup.py to include data files
• Added function to return validator from schema files