Call np.import_array(). (#83)

Refresh infra-structure and support cython 3.x (#16)

* Refresh infra-structure and support cython 3.x

* review actions

* add workflow_dispatch to ci-tests

Merge pull request #12 from lbdreyer/version_bump

Bump version number; update file headers

Merge pull request #8 from rhattersley/release

Bump version

Release mo_pack v0.1.0.