[WIP] Evolve anisotropic pressure.

[bendudson]

Evolves energy and pressure anisotropy variables, calculating parallel and perpendicular pressure.

[codecov]

Codecov Report

❌ Patch coverage is 8.44444% with 206 lines in your changes missing coverage. Please review.
✅ Project coverage is 36.19%. Comparing base (35a796b) to head (a035021).

Files with missing lines	Patch %	Lines
src/evolve_anisotropic_pressure.cxx	0.00%	180 Missing ⚠️
src/evolve_momentum.cxx	42.22%	25 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #409      +/-   ##
==========================================
- Coverage   36.92%   36.19%   -0.73%     
==========================================
  Files          94       95       +1     
  Lines        9117     9308     +191     
  Branches     1315     1338      +23     
==========================================
+ Hits         3366     3369       +3     
- Misses       5388     5576     +188     
  Partials      363      363              

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