Decouple rendering of text part references from display of text part content

[jacobwegner]

• For Read Homer, we implemented the book / line citation scheme:

1.1
1.2
1.3

• For Digital Sira, we didn't show text part references. We styled things a "line" at a time (which usually ended up being paragraphs):

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For things like the Bellum Alexandrinum, we want to cite the seg elements, but render in paragraphs:

This would also be useful for things like poetry where we may have caesuras or half-lines within the citation scheme; it might also help us to improve our resolution / display of "front matter".

Given:

1. CHAPTER 1
How @jacobwegner demonstrated that front matter is currently omitted from display
1.1 This is the first line
1.2 This is the second line

We currently would resolve "1.1-1.2" (the lowest citable nodes):

1.1 This is the first line
1.2 This is the first line

But we really want to do something more like:

1. CHAPTER 1
How @jacobwegner demonstrated that front matter is currently omitted from display
1.1 This is the first line
1.2 This is the second line