Fix missing standard includes, reduce warnings in doxygen-enabled builds

[aPonza]

I can fix the namespace 'std' stuff tomorrow

from #3744 (comment)

This reduces the doxygen-clang log by 1075 lines, bringing it to 16880 if we consider the ones from #3701 as done. There is absolutely no dependency between these two PRs though.

[kunaltyagi]

Thanks :)

[aPonza]

d:\a\1\s\surface\include\pcl\surface\impl\surfel_smoothing.hpp(84): fatal error C1083: Cannot open compiler intermediate file: 'pcl_surface.dir\Release\surfel_smoothing.obj': Not enough space [D:\a\build\surface\pcl_surface.vcxproj]
LINK : fatal error LNK1257: code generation failed [D:\a\build\surface\pcl_surface.vcxproj]

link

[SergioRAgostinho]

Any reason to keep the comment around?

[aPonza]

Commented lines like

pcl/recognition/include/pcl/recognition/surface_normal_modality.h

Line 1122 in 9427da1

//std::cerr << min_sqr_distance;