Pynapple

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

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- `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.

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- Fixed minor bug with tkinter

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- PyQt removed from the list of dependencies

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- Core functions rewritten with Numba

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