Feature/tag texts

[dpvc]

This PR changes the handling of tags to make three separate mtext nodes: one for the left delimiter, one for the tag number, and one for the right delimiter.

The formatTag() and formatRef() functions now take either a string or a triple of strings to use for the tag format. If it is just a string, then parentheses, brackets, and braces are removed from the beginning and ending of the thing to make the triple, otherwise, the string is used as is (and only a single mtext will be created).

The tests are updated to take these changes into account.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.71%. Comparing base (efcdd46) to head (c97db48).
⚠️ Report is 2 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1345      +/-   ##
===========================================
- Coverage    86.72%   86.71%   -0.01%     
===========================================
  Files          337      337              
  Lines        84145    84147       +2     
  Branches      4769     4771       +2     
===========================================
- Hits         72971    72968       -3     
- Misses       11151    11156       +5     
  Partials        23       23              

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