Convert boost::shared_ptr to pcl::shared_ptr

[kunaltyagi]

• Provides a pcl::shared_ptr
• Converts all references to boost::shared_ptr to pcl::shared_ptr
• Fixes headers for successful compilation

This PR will allow for 2 PCL releases: 1.10 (with boost::shared_ptr) and 1.11 (with std::shared_ptr) with just 1 commit in the changelog.

Results achieved by:

1. Provide the alias
2. Copy the file in backup location

3. for dir in `ls */ -d`; do
     grep 'boost::shared_ptr' $dir -lr | xargs sed 's/boost::shared_ptr/shared_ptr/' -i;
   done
   

4. Copy the file back
5. Fix compilation errors

[kunaltyagi]

Feel free to close without merge (based on previous discussions)

[taketwo]

Do you think this is ready for merging?

Could you perhaps write up some explanation (for the changelog) what the users are supposed to do with this class?

[kunaltyagi]

some explanation (for the changelog)

With pcl::shared_ptr? How about:

Starting with PCL 1.10, to ensure compatibility with future PCL releases, please use pcl::make_shared and the Class::Ptr + Class::ConstPtr type-alias instead of using direct names like{boost, std}::shared_ptr or {boost, std}::make_shared. There's also pcl::shared_ptr which offers the same abstraction for non-PCL types.

In my other projects, I actually use this abstraction (which needs explicit knowledge). I might improve that abstraction further actually.

[taketwo]

Thanks for the blurb, will integrate it into the changelog.

Can you please squash formatter changes into commits? I'd like to merge soon and finally release 1.10 this weekend.

[kunaltyagi]

Can you please squash formatter changes into commits?

Sure. I'll send the changes in a few hours. Sorry for the delay