Add PointCloudLocalTriangulation interface

[lkskstlr]

Add class in src/point_cloud.cpp
Expose class in point_cloud.py
Add test based on cartwheel pointcloud

[lkskstlr]

Dear @nmwsharp,

thanks again for your amazing work.

As discussed, here is the pull request. The test is based on a cartwheel pointcloud (see image).

I thought that you maybe have a better idea of how you would want this functionality to be referenced in the main README and hence did not do this.

Cheers Lukas

Point cloud used for the test with local triangulation

[nmwsharp]

I made one small comment above, but otherwise this looks good-to-go. Thank you for contributing!

[nmwsharp]

Merged! Thanks again :)

I also added some quick "docs" in the README so perhaps others can find the new function.

I pushed the new build; as long as nothing goes wrong it should be available on the package managers by tomorrow. Please follow up if anything seems wrong.

[lkskstlr]

Thanks :)