Improve typing, docstrings, convenience, DRY in stagematrix calibration (#149)

* Remove repetition, add, fix type hints to stagematrix code

* Fix correctly set stage with backlash + simplify writing

* Fixes needed for tecnai + some notes

* Use normalization None if normalized `phase_cross_correlation` doesn't work

* Fix broken main_entry logic, simplify conditional mess, improve type hints

* Add `get_or_roughly_estimate_pixelsize`, remove comments

* Revert unnecessary function name change

* DRY `calibrate_stage_all` docstring

* Implementation of `pairwise` can be slightly shorter

* Fix type hint of `pairwise`

* Address mypy suggestions to a reasonable degree

Author: Baharis

src/instamatic/_typing.py

@@ -5,6 +5,6 @@
 
 from typing_extensions import Annotated
 
-AnyPath = Union[str, bytes, os.PathLike]
+AnyPath = Union[str, os.PathLike]
 int_nm = Annotated[int, 'Length expressed in nanometers']
 float_deg = Annotated[float, 'Angle expressed in degrees']