Attempt to parse invalid beginning lines of xref table subsections.

[adrg]

Addresses #4

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This change is 

[codecov]

Codecov Report

Merging #91 into development will decrease coverage by 5.13%.
The diff coverage is 75%.

@@               Coverage Diff               @@
##           development      #91      +/-   ##
===============================================
- Coverage        60.16%   55.02%   -5.14%     
===============================================
  Files              154      154              
  Lines            27985    27993       +8     
===============================================
- Hits             16836    15404    -1432     
- Misses           10764    10765       +1     
- Partials           385     1824    +1439

Impacted Files	Coverage Δ
core/parser.go	68.33% <75%> (-8.14%)	⬇️
internal/e2etest/utils.go	60% <0%> (-20%)	⬇️
ps/exec.go	62.96% <0%> (-18.52%)	⬇️
core/security/handlers.go	33.33% <0%> (-16.67%)	⬇️
model/optimize/image_ppi.go	59.7% <0%> (-16.42%)	⬇️
model/signature_handler.go	55.04% <0%> (-15.6%)	⬇️
model/reader.go	50.84% <0%> (-14.22%)	⬇️
ps/operations.go	53.45% <0%> (-13.68%)	⬇️
core/stream.go	31.08% <0%> (-13.52%)	⬇️
extractor/image.go	65.51% <0%> (-12.94%)	⬇️
... and 95 more

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[gunnsth]

LGTM