Kangas

New in this release:
1. Embedding projections for "pca" and "t-sne"
2. removed tornado from requirements
3. added opentsne to requirements
4. bug fixes

New in this release:
1. Fixed rectangle x0,y0,x1,y1 ordering to not crash more restrictive pillow (PIL)
2. Added kangas.Embedding() to SDK and UI
3. Some bug fixes and refinements

Changes in this release:

1. Optimizations for thumbnail creation
2. Renamed static paths for frontend

New in this release:
1. Fix to ProgressBar (thanks fnauman for reporting)
2. Updated notebooks with markdown versions, with "Open in Colab" links
3. Small fixes in both frontend and backend
4. Allows PosixPaths as paths to save/open datagrids
5. All launch flags can be set by kg.show() and dg.show()

New in this version:
1. Label colors may have changed for those labels with more than 5 characters; the previous algorithm was JavaScript-specific. Now, it can replicated in other languages
2. Added [Image.add_mask()](https://github.com/comet-ml/kangas/wiki/Image#add_mask) and [Image.add_mask_metric()](https://github.com/comet-ml/kangas/wiki/Image#add_mask_metric)
3. Thumbnail images now show annotations, including masks, bounding boxes, regions, and lines
4. In the full image views, regions now show a border
5. Vector data now properly shows as JSON
6. Column names cannot contain ":" or ","
7. Fixed a bug in [DataGrid.add_iou_column()](https://github.com/comet-ml/kangas/wiki/DataGrid#append_iou_column)
8. Many bug fixes

New in this version:
1. mask metric colorlevels
2. additional mask functions
3. fixed bug in iou