Added DataProviders shared interface for data providers

[tjcouch-sil]

Now you don't need to get and specify a bunch of IDataProviders and DataProviderDataTypes from other extensions in order to get the proper types for data providers.

papi.dataProvider.get('data provider name')
useData('data provider name').DataType(selector, default, options)
useProjectData('project id', 'project type').DataType(selector, default, options)

*Note: I may try to swap the parameters for useProjectData in a commit in a bit. The changes may be strange, though, so I may leave it in the end

Relates to #318

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[lyonsil]

Reviewed 33 of 33 files at r1, all commit messages.
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[lyonsil]

Reviewed 20 of 20 files at r2, all commit messages.
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