Refine fm serializer and user entered jsonschema
Refine fm serializer and user entered jsonschema

- Add file tags to datacite FM subjects
- Rely on file created date for publication year
- allow for multiple funders
- rename file > osfstorage_file to avoid overshadowing built in

CenterForOpenScience/osf.io,adlius/osf.io,baylee-d/osf.io,adlius/osf.io,CenterForOpenScience/osf.io,mfraezz/osf.io,saradbowman/osf.io,mfraezz/osf.io,mfraezz/osf.io,CenterForOpenScience/osf.io,aaxelb/osf.io,pattisdr/osf.io,felliott/osf.io,cslzchen/osf.io,felliott/osf.io,pattisdr/osf.io,Johnetordoff/osf.io,aaxelb/osf.io,baylee-d/osf.io,brianjgeiger/osf.io,adlius/osf.io,adlius/osf.io,baylee-d/osf.io,CenterForOpenScience/osf.io,aaxelb/osf.io,mfraezz/osf.io,pattisdr/osf.io,Johnetordoff/osf.io,brianjgeiger/osf.io,cslzchen/osf.io,Johnetordoff/osf.io,Johnetordoff/osf.io,felliott/osf.io,brianjgeiger/osf.io,saradbowman/osf.io,mattclark/osf.io,mattclark/osf.io,aaxelb/osf.io,felliott/osf.io,mattclark/osf.io,cslzchen/osf.io,brianjgeiger/osf.io,cslzchen/osf.io