Kwarray

Fixed
* Fixed bug in `ArrayAPI.compress` with multi-dimensional tensors
* Fixed bug in `ArrayAPI.ones_like`, where it returned zeros

Added
* Add `clear` to `DataFrameLight`
* Added `util_torch` with `one_hot_embedding`
* Add `ArrayAPI.matmul`
* Add various `ArrayAPI` functions

Changed
* Speed improvements
* `boolmask` now automatically converts data to an integer ndarray

Added
* Initial port of functionality from KWIL
- `fast_rand.py`
- `util_groups.py`
- `util_numpy.py`
- `util_random.py`
- `util_torch.py`
- `util_averages.py`
- `distributions.py`
- `dataframe_light.py`
- `arrayapi.py`
- `algo_assignment.py`