support for array viewingHint

[eroux]

(see UniversalViewer/universalviewer#627), the following manifest fails:

http://eroux.fr/testmarcfail.json

because it has

"viewingHint":["continuous"]

but the spec says:

Any resource type may have one or more viewing hints.

so my understanding is that arrays are allowed as value for viewingHint.

[rsinghal]

@aeschylus We should confirm Manifesto handles this use case and then this issue will be resolved in Mirador 3.

[marlo-longley]

I don't have a full answer to this, but I looked into it a bit ~

I do not see any examples of an Array being used for ViewingHint in Manifesto -- for example all the fixture files use single values.

Additionally, the way I am reading this, the vocabulary that Manifesto uses for its types only shows single values (e.g. "paged").