Geometrical EBSD simulation notebook

[hakonanes]

Description of the change

• Add user guide notebook detailing the use and flexibility of the EBSDSimulationGenerator and the GeometricalEBSDSimulation classes
• Clarify some attribute documentation in GeometricalEBSDSimulation
• Suppress warnings described in a now closed PR to HyperSpy: Add visibility boolean for all markers, only used by text markers hyperspy/hyperspy#2558

Progress of the PR

• Change use of diffsims.crystallography.ReciprocalLatticePoint._hkldata to hkldata
• Use EDAX TSL reference frame instead of Bruker
• Use EDAX TSL pattern center definition instead of Bruker
• Docstrings for all functions
• Unit tests with pytest for all lines
• Clean code style by running black via pre-commit

For reviewers

• Check that the PR title is short, concise, and will make sense 1 year
  later.
• Check that new functions are imported in corresponding __init__.py.
• Check that new features, API changes, and deprecations are mentioned in
  the unreleased section in doc/changelog.rst.

[hakonanes]

Failing tests are related to me removing the private attribute diffsims.crystallography.ReciprocalLatticePoint._hkldata in the latest diffsims v0.4 release, and I haven't updated it's use in kikuchipy yet.

[hakonanes]

The tests now fail because I forgot to remove the rotation of orientations used by the test from TSL's to Bruker's sample reference frame here: https://github.com/pyxem/kikuchipy/blob/master/kikuchipy/conftest.py#L171

[hakonanes]

I'll follow up this PR with another PR creating a notebook out of the reference frame reST file, where the conventions will be updated.

[hakonanes]

Actually, it's much simpler to use Bruker's PC convention since their PC origin is in the upper left corner of the detector, which is also how matplotlib plots arrays. Thus, I think we should stick with TSL's sample reference frame but Bruker's PC convention.