Remove more globals

[jngrad]

Partial fix for #2628

[codecov]

Codecov Report

Merging #3738 into python will decrease coverage by 0%.
The diff coverage is 88%.

@@          Coverage Diff           @@
##           python   #3738   +/-   ##
======================================
- Coverage      89%     88%   -1%     
======================================
  Files         548     548           
  Lines       24455   24422   -33     
======================================
- Hits        21777   21717   -60     
- Misses       2678    2705   +27     

Impacted Files	Coverage Δ
src/core/reaction_ensemble.hpp	74% <ø> (ø)
src/core/reaction_ensemble.cpp	86% <88%> (-1%)	⬇️
src/scafacos/Scafacos.cpp	77% <0%> (-15%)	⬇️
src/core/global.cpp	73% <0%> (-11%)	⬇️
src/core/grid_based_algorithms/lb.cpp	94% <0%> (-3%)	⬇️
...re/bonded_interactions/bonded_interaction_data.cpp	91% <0%> (-2%)	⬇️
src/core/electrostatics_magnetostatics/dipole.cpp	62% <0%> (-2%)	⬇️
...rc/core/electrostatics_magnetostatics/scafacos.cpp	70% <0%> (-1%)	⬇️
src/core/nonbonded_interactions/gay_berne.hpp	97% <0%> (-1%)	⬇️
src/core/electrostatics_magnetostatics/p3m.cpp	87% <0%> (-1%)	⬇️
... and 9 more

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