Spec2nii

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- Fixed a bug in Philips spar/sdat orientations - this will affect voxels with rotations in more than one axes.
- Fixed a bug in Philips DICOM orientations - this will affect voxels with rotations in more than one axes.
- Python 3.7 now in [end of life](https://devguide.python.org/versions/) status and is no longer supported.
- `spec2nii dump/extract/insert` can now be used to inspect and fix non-compliant NIfTI-MRS files.

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- Stop tests being vendored as a top-level package. Bug introduced in `0.6.9`.

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- Add handling for the `fidall` sequence in GE.
- Add handling for the `slaser` sequence in GE.
- Update to nifti-mrs-tools 1.0.0 API.
- Minor code fixes contributed by the community.

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- Added handling for the GE jpress sequence (for JH HURCULES sequence)
- Added twix handling of the HYPER (smm_svs_herc_hyper) sequence (added by Aaron Gudmundson)
- Better handling of partial acquisitions of Siemens and Philips HYPER sequence.

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- `spec2nii insert` can now insert a compliant header object into a non-compliant NIfTI file to generate a new NIfTI-MRS file.
- `spec2nii insert` can now update dwelltime using the optional `--dwelltime` argument.

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- Added in ability to generate empty NIfTI-MRS for twix-pathway MRSI scans.