Also added mayavi to requirements in setup.cfg and environment.yml.
Added documentation on how to activate 3D notebook plotting with mayavi.
Fixed some bugs in io_field.py.
Fixed bug in reader of llg.py.

utils: Has quaternion and misc submodules
    misc has levi_civita and interp_to_regular_grid (used later for io)
field: Added HyperSpy support (get/set_signal)
    added copy/rotate/rot90/set_vector/get_vector methods

Deleted print statements, superfluous log, TODOs, added a few comments.