Add PEF (Pentax Electronic Format) support

[bep]

No description provided.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 90.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 78.41%. Comparing base (c73e1de) to head (5eca450).

Files with missing lines	Patch %	Lines
gen/main.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #63      +/-   ##
==========================================
+ Coverage   78.39%   78.41%   +0.02%     
==========================================
  Files          16       16              
  Lines        2101     2103       +2     
==========================================
+ Hits         1647     1649       +2     
  Misses        317      317              
  Partials      137      137              

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