revert std::function back to function pointers

[neheb]

The former has too much overhead. No point in it.

Signed-off-by: Rosen Penev rosenp@gmail.com

[neheb]

seems conan has issues.

[piponazo]

@neheb You need to rebase your branch in top of main to avoid the CI failures

[codecov]

Codecov Report

Merging #2313 (bb6a6ae) into main (2c5e1d8) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #2313      +/-   ##
==========================================
- Coverage   63.48%   63.47%   -0.01%     
==========================================
  Files         118      118              
  Lines       19601    19599       -2     
  Branches     9576     9574       -2     
==========================================
- Hits        12443    12441       -2     
  Misses       5091     5091              
  Partials     2067     2067              

Impacted Files	Coverage Δ
app/actions.hpp	100.00% <ø> (ø)
include/exiv2/xmp_exiv2.hpp	89.47% <ø> (ø)
src/convert.cpp	51.40% <ø> (ø)
src/makernote_int.hpp	92.30% <ø> (ø)
src/tiffimage_int.hpp	80.00% <ø> (ø)
app/actions.cpp	64.97% <100.00%> (ø)
src/crwimage_int.hpp	92.85% <100.00%> (-0.17%)	⬇️
src/tiffimage_int.cpp	79.82% <100.00%> (ø)
src/tiffvisitor_int.cpp	79.38% <100.00%> (ø)
src/xmp.cpp	76.54% <100.00%> (-0.05%)	⬇️

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