Export views to the Trix global

[hopsoft]

Apply the same export strategy to views that's used for models and controllers.

This will allow more flexibility for folks to extend the library. For example, it will allow people to take explicit control when needed. For example,

const attachment = new Trix.Attachment({ content, contentType: 'application/vnd.example' })
const piece = new Trix.AttachmentPiece(attachment)
const view = new Trix.AttachmentView(attachment, { piece })

const figure = Trix.makeElement({
 tagName: 'figure',
 className: view.getClassName(),
 data: view.getData(),
 editable: false
})

figure.innerHTML = attachment.getContent()

Note that views were exposed on the Trix global in previous versions of the lib.

[afcapel]

Makes sense, thanks @hopsoft!