Actipy

What's Changed
- Use `group_keys=False` to shut Pandas FutureWarning

What's Changed
- Fix bug in `detect_nonwear`: When input file is too small, `stationary_len` can become an empty series whose `dtype` defaults to float in Pandas, making comparison with timedelta types fail.

What's Changed
- Fix bug: force copy when loading parsed data, otherwise cleanup of temporary files fails 6a32d7ebcec90d1f6c1f506794c3b2ab1813afb2

What's Changed
- Reverted major changes since `v0.0.2` involving out-of-memory computation using `memmap` and `tempfile` because these were causing issues in Windows, and sometimes in Linux-based clusters. This is a temporary resolution while we look into this.

What's Changed
- **Minimal required version is now Python 3.8**. This is to be able to require `numpy>=1.22` which has a vulnerability patch. 3f8ae33478025ee9c37c84bf4a06d910f94342fb
- More flexible dependencies 3f8ae33478025ee9c37c84bf4a06d910f94342fb
- Include `extra_requires=...` in setup.py. Now can use `pip install actipy[dev]`, `pip install actipy[dev,docs]` etc. for easier dev setup. 7e47fffedae9b76ce8f424435dd90c9f2da234ca