WIP: bill.Receipt

[samlown]

Replaces #322

[codecov]

Codecov Report

Attention: Patch coverage is 53.45455% with 128 lines in your changes missing coverage. Please review.

Project coverage is 82.50%. Comparing base (ab5152d) to head (d0f09bd).

Files with missing lines	Patch %	Lines
bill/receipt.go	10.43%	103 Missing ⚠️
bill/receipt_line.go	0.00%	19 Missing ⚠️
bill/utils.go	25.00%	4 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #379      +/-   ##
==========================================
- Coverage   82.90%   82.50%   -0.41%     
==========================================
  Files         242      245       +3     
  Lines       11875    12138     +263     
==========================================
+ Hits         9845    10014     +169     
- Misses       1670     1764      +94     
  Partials      360      360              

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