Prefer standard [[deprecated]] attribute

[taketwo]

The [[deprecated]] attribute is part of the standard; no workarounds for different compilers is needed anymore. Thus PCL_DEPRECATED macro is removed.

[taketwo]

By the way, this attribute was first introduced in c++14. As such, this can be a good candidate for cxx_std_14 proxy to solve #2697.

[SergioRAgostinho]

Thanks

[7680x4320]

MSVC 2015 Update 3 can't build segmentation module after this change.
It seems a bug of MSVC 2015 Update 3.

[taketwo]

If I interpret the answer you linked correctly, then the only problem is SupervoxelClustering constructor, which is declared but not defined in the header? We can simply move the definition to the header, especially considering the fact that it's exactly the same as the other constructor. That is, have the following:

[[deprecated("jadda jadda...")]]
SupervoxelClustering (float voxel_resolution, float seed_resolution, bool) : SupervoxelClustering (voxel_resolution, seed_resolution) { }

[7680x4320]

Your solution works fine, thanks!

[taketwo]

Great, please send a PR.