Seppy

What's Changed

- Unify different resampling functions and move them to seppy.util (import with `from seppy.util import resample_df`)
- FILLVAL replacement for CDF files now done within sunpy
- Add tests & correspondent GitHub Actions


**Full Changelog**: https://github.com/serpentine-h2020/SEPpy/compare/v0.1.6...v0.1.7

What's Changed
* Add [STEREO MAGPLASMA (PLASTIC) data](https://cdaweb.gsfc.nasa.gov/misc/NotesS.html#STA_L2_MAGPLASMA_1M) loading by jgieseler in https://github.com/serpentine-h2020/SEPpy/pull/24

**Full Changelog**: https://github.com/serpentine-h2020/SEPpy/compare/v0.1.5...v0.1.6

What's Changed
* Remove proton-contaminated data from experimental SOHO/EPHIN electron dataset in the onset determination tool (for internal use only, https://github.com/serpentine-h2020/SEPpy/pull/22)


**Full Changelog**: https://github.com/serpentine-h2020/SEPpy/compare/v0.1.4...v0.1.5

What's Changed
* `print_energies()` now provides a Pandas DataFrame (4)
* Restore font sizes & co after plotting (5)
* Fix a bug that occurred if `channel` was not of type 'list' for PSP/ISʘIS-EPIHI (16)
* Add support for Wind/3DP and PSP/ISʘIS to the dynamic spectrum, onset determination, and TSA tools of https://github.com/serpentine-h2020/serpentine (solving issues 1-6 of that repo)
* Add support for experimental SOHO/EPHIN electron dataset to onset determination tool (for internal use only, 20)

**Full Changelog**: https://github.com/serpentine-h2020/SEPpy/compare/v0.1.3...v0.1.4

- adjust plot labels

- add inf_inj_time() function to tools