Slicerio

Fixed segment extraction for 3D input segmentation.

Add support for loading segmentation from NIFTI label image file.

**Full Changelog**: https://github.com/lassoan/slicerio/compare/1.0.0...1.1.0

What's Changed
* Segmentation support improvements: simplify segmentation interface (single object represents a segmentation), extract segments by terminology codes
* Support pathlib.Path paths by johannesu in https://github.com/lassoan/slicerio/pull/6
* keep pixel type the same when extracting labels by vanossj in https://github.com/lassoan/slicerio/pull/8

New Contributors
* johannesu made their first contribution in https://github.com/lassoan/slicerio/pull/6
* vanossj made their first contribution in https://github.com/lassoan/slicerio/pull/8

**Full Changelog**: https://github.com/lassoan/slicerio/commits/1.0.0