Remove pack_snapshot

[MichaelClerx]

See #729

[codecov]

Codecov Report

Merging #730 (d340e68) into main (a480ec8) will increase coverage by 0.01%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##             main      #730      +/-   ##
===========================================
+ Coverage   99.98%   100.00%   +0.01%     
===========================================
  Files          99        99              
  Lines       19262     19218      -44     
===========================================
- Hits        19260     19218      -42     
+ Misses          2         0       -2     

Impacted Files	Coverage Δ
myokit/__init__.py	100.00% <ø> (ø)
myokit/_aux.py	100.00% <ø> (ø)
myokit/lib/deps.py	100.00% <0.00%> (+0.46%)	⬆️

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