Simplify coordinates module

[dominiquesydow]

Description

Simplify coordinates module.

Todos

• [x] Module folder remote/coordinates/ and local/coordinates/ > module files remote/coordinates.py and local/coordinates.py (removing redundant behavior in previous coordinates submodules complex.py, ligand.py, ...
• [x] Move mol2/pdb loading functions from utils.py to remote/coordinates.py and local/coordinates.py
• [x] Update tutorial - add local example data

Questions

Status

• [ ] Ready to go

[dominiquesydow]

Closing this PR, since code moved here:

https://github.com/volkamerlab/opencadd