Spm12

To go with the release of AmyPET

- fix `matlab.engine.EngineError` (19)
+ bump `miutil.mlab` dependency (https://github.com/AMYPAD/miutil/pull/32)
- add `spm_dir_eng` (18)
- replace `pkg_resources` => `importlib.resources`
- minor bug fixes
+ SPM normalisation: change vox size definition
+ fix `matlab.double` array bug
- misc code tidy & linting
+ replace `black` => `yapf`
+ fix badges (https://github.com/badges/shields/issues/8671)
- misc build/test/CI framework updates (19)
+ migrate `setup.{cfg,py}` => `pyproject.toml`
+ ignore `matlab.engine` PEP440 non-compliance (vis. https://github.com/pypa/setuptools/issues/3772)
+ drop Python<=3.6 support
+ update workflows
+ update `pre-commit` tests

- fix & update `centiloid` (17)
- add Py3.10, drop Py2.7 support
- misc framework updates

- add centiloid processing: `regseg.seg_spm()`, `regseg.normw_spm()` (16)
- add `utils.spm_dir()`
- misc restructuring
- misc build framework updates

- replace `brainweb` => `miutil` for download & extraction (12)

- update tests (11)
+ fix tolerances
+ fix `matlab` not found
+ use fixtures
+ automate data download
- tests & build: misc framework updates (11)
+ skip `devel` PRs
+ drop py3.5
+ fix py2.7