Moved connectivity_preserving_thinning method from Skeletonization2D to PixelSearch.
Improved methods dist_transform_skeletonization and remove_isolated_short_segments
to avoid using variables by value.
Moved conectivity_preserve_thinnig back to Skeletonization2d from PixelSearch
Skeletonization3d added methods to get frames and image size from cameras
Refine_division in SkeletonFitting now works for the front pair of legs.

With this method a few more frames get the right division