Add more DNG 1.6 tags

[kmilos]

Backport of #2023

[codecov]

Codecov Report

Merging #2026 (64e4dfc) into 0.27-maintenance (afee6cc) will not change coverage.
The diff coverage is n/a.

@@                Coverage Diff                @@
##           0.27-maintenance    #2026   +/-   ##
=================================================
  Coverage             58.89%   58.89%           
=================================================
  Files                   146      146           
  Lines                 23002    23002           
  Branches              11809    11809           
=================================================
  Hits                  13548    13548           
  Misses                 6688     6688           
  Partials               2766     2766           

Impacted Files	Coverage Δ
src/tags_int.cpp	77.02% <ø> (ø)

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[kmilos]

Thanks!