Move unused analysis functions

[mogres]

Problem

Closes #225

Solution

Move unused functions to utils.py

Type of change

Maintenance

Change summary:

• Moved some unused analysis functions to utils.py
• Moved functions related to spilr to the cellpack-analysis repository

Steps to Verify:

Packing using the Analysis workflow run as expected

Keyfiles:

1. Analysis.py

[github-actions]

Packing analysis report

Analysis for packing results located at cellpack/tests/outputs/test_spheres/spheresSST

Ingredient name	Encapsulating radius	Average number packed
ext_A	25	236.0

Packing image

Distance analysis

Expected minimum distance: 50.00
Actual minimum distance: 50.01

Ingredient key	Pairwise distance distribution
ext_A

[mogres]

@meganrm, almost all of the moved functions are unused so they may have references to non-existent class objects etc.
My idea was to move functions to utils.py to keep around as backup if needed in the future, but I am also happy to delete them if that makes more sense. We can always restore them from the git history if required.

[mogres]

@meganrm removed the functions from utils

[rugeli]

Looks good to me, the code is much cleaner!