Codeql analysis

[kevinbackhouse]

Code scanning was enabled on the old-master branch, but didn't get transferred to main. This pull request is a rebase of @clanmills's original commit onto main. I also added main to the list of branches to test.

[codecov]

Codecov Report

Merging #1747 (f7bd17f) into main (fe83c73) will increase coverage by 0.04%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #1747      +/-   ##
==========================================
+ Coverage   66.89%   66.94%   +0.04%     
==========================================
  Files         151      151              
  Lines       20754    20794      +40     
==========================================
+ Hits        13883    13920      +37     
- Misses       6871     6874       +3     

Impacted Files	Coverage Δ
src/preview.cpp	57.46% <0.00%> (-0.29%)	⬇️
samples/Jzon.cpp	33.39% <0.00%> (-0.18%)	⬇️
src/webpimage.cpp	64.97% <0.00%> (-0.17%)	⬇️
src/pgfimage.cpp	55.93% <0.00%> (-0.11%)	⬇️
src/image.cpp	72.51% <0.00%> (-0.05%)	⬇️
src/http.cpp	0.00% <0.00%> (ø)
src/version.cpp	91.71% <0.00%> (ø)
src/jpgimage.cpp	77.66% <0.00%> (ø)
src/crwimage_int.hpp	84.37% <0.00%> (ø)
src/cr2header_int.hpp	50.00% <0.00%> (ø)
... and 22 more

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[hassec]

Thanks @kevinbackhouse 👍