Split and cached model

[longemen3000]

(cached model)

• Adds a CachedEoS, that can perform caching.
  ideally, all caching operations should be done in this type instead of each model. a basic TP interpolation scheme is implemented for sat_pure.
  (split model)
• SingleParam, PairParam, AssocParam, GroupParam and SiteParam are "splittable", that is, split_model(param) will return a vector of params for each component. for that, SiteParam and GroupParam have now some parameters that were present before in the eos struct.
• GroupParam has a constructor that skips the csv, that constructor is only used if no csv to parse are passed.
• model.allcomponentnflattenedgroups -> model.groups.n_flattenedgroups
• model.allcomponentnsites -> model.sites.n_sites
• model.allgroupsnsites -> model.sites.n_sites (same)
• SiteParam now has a printing method. with that, all ClapeyronParams now have pretty printing
  new models:
  joback model is up, (a_ideal is missing)
  improvement in models:
• GERG2008 now uses the same printing structure that the rest of EoS uses
• SAFTgammaMie is around 2x faster, by sacrificing some pretty functions and using some static arrays)

[codecov-commenter]

Codecov Report

Merging #33 (227ee9b) into master (c2b281d) will decrease coverage by 3.61%.
The diff coverage is 24.20%.

@@            Coverage Diff             @@
##           master      #33      +/-   ##
==========================================
- Coverage   52.72%   49.10%   -3.62%     
==========================================
  Files          57       60       +3     
  Lines        4537     4916     +379     
==========================================
+ Hits         2392     2414      +22     
- Misses       2145     2502     +357     

Impacted Files	Coverage Δ
src/Clapeyron.jl	100.00% <ø> (ø)
src/methods/initial_guess.jl	25.00% <0.00%> (-0.51%)	⬇️
src/models/eos/SAFT/LJSAFT/LJSAFT.jl	0.00% <0.00%> (ø)
src/models/eos/cached/CachedEoS.jl	0.00% <0.00%> (ø)
...odels/eos/cached/sat_pure_aprox/TPInterpolation.jl	0.00% <0.00%> (ø)
src/models/eos/ideal/JobackIdeal.jl	0.00% <0.00%> (ø)
src/utils/visualisation.jl	0.00% <0.00%> (ø)
src/methods/methods.jl	13.33% <7.14%> (-86.67%)	⬇️
src/utils/ClapeyronParam.jl	19.02% <19.09%> (-2.33%)	⬇️
src/utils/macros.jl	41.26% <44.44%> (-14.00%)	⬇️
... and 18 more

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