Overwrite deepcopy for EBSD and EBSDMasterPattern to carry over custom properties

[hakonanes]

Description of the change

• Signal2D.deepcopy() is overwritten for the EBSD and EBSDMasterPattern signals to carry over the following custom properties:
  • EBSD: xmap and detector
  • EBSDMasterPattern: phase (orix.crystal_map.Phase), projection (str), and hemisphere
• Make the EBSD.xmap property settable. A private function located in kikuchipy.signals.util._crystal_map.py is added to ensure that the crystal map and EBSD signal has the same navigation shape and navigation step sizes (e.g. 1 um). This function should be used whenever the EBSD.xmap property is used, ensuring that a reasonable error message is raised if the map and signal aren't compatible.

Close #345.

Progress of the PR

• Docstrings for all functions
• Unit tests with pytest for all lines
• Clean code style by running black via pre-commit

Minimal example of the bug fix or new feature

>>> import numpy as np
>>> import kikuchipy as kp
>>> s = kp.data.nickel_ebsd_small()
>>> s.xmap
<CrystalMap repr>
>>> s.detector
<EBSDDetector repr>
>>> s2 = s.deepcopy()
>>> np.may_share_memory(s.xmap.rotations.data, s2.xmap.rotations.data)
False
>>> np.may_share_memory(s.detector.pc, s2.detector.pc)
False

For reviewers

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

[hakonanes]

Merging after checks pass.