Reload charge etc from file

[t-young31]

Resolves #208

>>> from autode import Molecule
>>> mol = Molecule(smiles="[O+]", mult=2, charge=1, solvent_name="water")
>>> mol.print_xyz_file(filename="tmp.xyz")
>>> Molecule("tmp.xyz")
Molecule(tmp, n_atoms=1, charge=1, mult=2)

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Checklist

• The changes include an associated explanation of how/why
• Test pass
• Documentation has been updated
• Changelog has been updated

[codecov]

Codecov Report

Merging #305 (13632fb) into v1.4.1 (d29a528) will increase coverage by 0.12%.
The diff coverage is 97.72%.

@@            Coverage Diff             @@
##           v1.4.1     #305      +/-   ##
==========================================
+ Coverage   97.20%   97.33%   +0.12%     
==========================================
  Files         204      206       +2     
  Lines       22896    23017     +121     
==========================================
+ Hits        22256    22403     +147     
+ Misses        640      614      -26     

Flag	Coverage Δ
unittests	97.33% <97.72%> (+0.12%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
autode/input_output.py	100.00% <100.00%> (ø)
autode/path/path.py	98.82% <100.00%> (ø)
autode/species/molecule.py	99.01% <100.00%> (+0.04%)	⬆️
autode/utils.py	94.11% <100.00%> (+12.19%)	⬆️
tests/test_species.py	100.00% <100.00%> (ø)
autode/species/species.py	98.88% <81.81%> (-0.36%)	⬇️

... and 7 files with indirect coverage changes