Update SBLGNT lowfat and add TSV export

[jacobwegner]

What's in this PR?

This PR into sblgnt-trees:

• Lowfat
  • Adds SBLGNT generation to the transform-to-lowfat.sh bash script
  • Fixes a bug in lowfat-macula-greek.xquery that caused us to drop text nodes (h/t @ryderwishart)
  • Adds english and chinese attributes to SBLGNT Lowfat
  • Adds sblgntlowfat.xml, mirroring Nestle1904/lowfat/nestle1904lowfat.xml
• TSV
  • Repurposes the greek-lowfat-to-tsv.xq XQuery module for generating TSV output for SBLGNT
  • Nestle1904/TSV/macula-greek.tsv renamed to Nestle1904/tsv/macula-greek-Nestle1904.tsv
  • Adds SBLGNT/tsv/macula-greek-SBLGNT.tsv
  • Adds instructions on generating the SBLGNT TSV

Things to point out

• We are using @chinese in macula-greek but @mandarin in macula-hebrew. Should we be consistent? (3fbfe5e)
• We end up adding empty english and chinese columns to the Nestle1904 TSV (7618654); my opinion is that this is ok and something we could revisit with further improvements to the transformation / serialization pipelines

Symphony deploy previews

Apposition: https://deploy-preview-271--symphony-preview.netlify.app/?workspace=tree-comparison&treeQuery=//w[@junction=%22apposition%22]&osisRef=Matt.1.1

Searching @gloss

https://deploy-preview-271--symphony-preview.netlify.app/?workspace=tree-comparison&treeQuery=//w[@gloss=%22donkey%22]&osisRef=Matt.21.6

Compare @gloss and @english

• This link will load //w@[gloss=donkey]
• We can then modify the "SBLGNT" column to //w[@english="donkey"]; we don't yet support linking into two columns

Next steps

I will open a couple of follow-up PRs that add a TEI version of SBLGNT into the repo and share some processing pipelines that I think will be helpful going forward.

• Transform SBLGNT XML to make compatible with macula-greek TEI #81