C# SGMatrix and SGVectorList typemaps leak memory

[ghost]

In the out typemaps for both SGMatrix and std::vector<SGVector>, memory is allocated using malloc, but it's not freed.

https://github.com/shogun-toolbox/shogun/blob/c948611b1e075b731d92c109d22abe79279b0a77/src/interfaces/csharp/swig_typemaps.i#L37-L53

https://github.com/shogun-toolbox/shogun/blob/c948611b1e075b731d92c109d22abe79279b0a77/src/interfaces/csharp/swig_typemaps.i#L231-L256

These allocated buffers are passed to C# code as IntPtr, and can't be deallocated from there.

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[ghost]

I have a simple solution in mind. I will attend to this issue this weekend.

[gf712]

No rush! I just added this bot to clean up the repo