Serialize master file display title to iiif ranges

[masaball]

Closes #5539

[cjcolvar]

This looks fine to me.

I was a little concerned about changing the value of label in stream_details but a quick look through the code didn't reveal any place that was using it besides IiifCanasPresenter. (I did see that

avalon/app/views/modules/player/_video_js_element.html.erb

Line 77 in d10ed59

<a class='video-link' id='video-link-<%= @master_file.id %>' href="<%= master_file_url(@master_file.id) %>" target="_blank" rel="noreferrer noopener"><%= @master_file.title || @master_file.media_object.title %></a>

isn't using it or embed_title but that's out of scope of this PR.)

I'm also wandering if having a nil label in the manifest will cause any problems for ramp. I thought we may have been including them in other metadata but can't remember. I don't think that should hold up this PR though if you think it is okay.

[masaball]

When I was working on this yesterday the changes worked with existing items. However, I just uploaded a new item in this branch to check the error for Ramp #334 and the section label is broken so this will need to be reworked. It looks like there is different behavior for multi-section vs single section item title generation that I missed.