Pynapple

- Fix issue in NWB reader class with units
- Implement a linear interpolation function.

- NWB reader class
- NPZ reader class
- Folder class for navigating a dataset.
- Cross-correlograms function can take tuple
- New doc with mkdocs-gallery

- `TsGroup.to_tsd` and `Tsd.to_tsgroup` transformations
- `count` can take IntervalSet
- Saving to npz functions for all objects.
- `tsd.value_from` can take TsdFrame
- Warning message for deprecating current IO.

- Fixed minor bug with tkinter

- PyQt removed from the list of dependencies

- Core functions rewritten with Numba