create method to validate single value or separated values against YAML CVs where used

[briesenberg07]

See .yml entries in this list, from OD2_MAP docs:

• https://github.com/OregonDigital/OD2/blob/master/config/authorities/download.yml
• https://github.com/OregonDigital/OD2/blob/master/lib/oregon_digital/controlled_vocabularies/creator.rb
• https://github.com/OregonDigital/OD2/blob/master/lib/oregon_digital/controlled_vocabularies/subject.rb
• https://github.com/OregonDigital/OD2/blob/master/lib/oregon_digital/controlled_vocabularies/culture.rb
• https://github.com/OregonDigital/OD2/blob/master/lib/oregon_digital/controlled_vocabularies/style_period.rb
• https://github.com/OregonDigital/OD2/blob/master/lib/oregon_digital/controlled_vocabularies/ethnographic_term.rb
• https://github.com/OregonDigital/OD2/blob/master/lib/oregon_digital/controlled_vocabularies/scientific.rb
• https://github.com/OregonDigital/OD2/blob/master/lib/hyrax/controlled_vocabularies/location.rb
• https://github.com/OregonDigital/OD2/blob/master/lib/oregon_digital/controlled_vocabularies/historic_place.rb
• https://github.com/OregonDigital/OD2/blob/master/config/authorities/rights_statements.yml
• https://github.com/OregonDigital/OD2/blob/master/config/authorities/licenses.yml
• https://github.com/OregonDigital/OD2/blob/master/lib/oregon_digital/controlled_vocabularies/access_restrictions.rb
• https://github.com/OregonDigital/OD2/blob/master/config/authorities/languages.yml
• https://github.com/OregonDigital/OD2/blob/master/lib/oregon_digital/controlled_vocabularies/local_collection_name.rb
• https://github.com/OregonDigital/OD2/blob/master/lib/oregon_digital/controlled_vocabularies/repository.rb
• https://github.com/OregonDigital/OD2/blob/master/lib/oregon_digital/controlled_vocabularies/publisher.rb
• https://github.com/OregonDigital/OD2/blob/master/lib/oregon_digital/controlled_vocabularies/form_of_work.rb
• https://github.com/OregonDigital/OD2/blob/master/config/authorities/resource_types.yml
• https://github.com/OregonDigital/OD2/blob/master/lib/oregon_digital/controlled_vocabularies/work_type.rb
• https://github.com/OregonDigital/OD2/blob/master/lib/oregon_digital/controlled_vocabularies/media_type.rb
• https://github.com/OregonDigital/OD2/blob/master/lib/oregon_digital/controlled_vocabularies/institution.rb

[coleherman43]

Use Oregon Digital code options instead of rewriting everything in default. Could point to those, and report clearly if it doesn't exist (since Oregon Digital could move their code, it gets deleted, etc.)