revamp kwarg and dispatch handling for methods (NFC)

[longemen3000]

we now call a new function init_preferred_method(method,model,kwargs) to initialize a method. this helps specially in the cases where we need to define another methods for specific models (activity, composite models), while not interfering with the default args, and even expanding those. julia kwarg handling has improved, so using kwargs does not cause performance penalties like before. now we can do:

saturation_pressure(model,T,vl = 1.8e-5,vv = 0.03) #init_preferred_method(saturation_pressure,model::EoSModel,kwargs) = ChemPotVSaturation(;kwargs...)

tp_flash(model,p,T,z,equilibrium = :vle) #dispatch to MichelsenTPFlash
tp_flash(model,p,T,z) DETPFlash
tp_flash(activity_model,p,T,z) #RRTPFlash
tp_flash(activity_model,p,T,z,equilibrium = :vle) #RRTPFlash

all this while not touching any methods.
should solve "bubble_temperature no longer takes T0 as an initial guess for activity coefficient models" (#173)

[codecov]

Codecov Report

Merging #174 (42d29bc) into master (e6a31f6) will decrease coverage by 0.23%.
The diff coverage is 54.41%.

@@            Coverage Diff             @@
##           master     #174      +/-   ##
==========================================
- Coverage   86.25%   86.03%   -0.23%     
==========================================
  Files         219      219              
  Lines       14772    14836      +64     
==========================================
+ Hits        12742    12764      +22     
- Misses       2030     2072      +42     

Impacted Files	Coverage Δ
src/base/EoSModel.jl	90.47% <ø> (ø)
src/methods/methods.jl	76.31% <0.00%> (-1.02%)	⬇️
.../property_solvers/multicomponent/multicomponent.jl	74.25% <ø> (ø)
...y_solvers/singlecomponent/saturation/AntoineSat.jl	87.09% <ø> (-3.82%)	⬇️
src/models/Activity/methods/Michelsentp_flash.jl	94.87% <0.00%> (-2.50%)	⬇️
...ethods/property_solvers/multicomponent/tp_flash.jl	46.15% <18.18%> (-24.44%)	⬇️
...ds/property_solvers/multicomponent/bubble_point.jl	75.44% <36.36%> (-2.92%)	⬇️
...thods/property_solvers/multicomponent/dew_point.jl	72.05% <36.36%> (-2.60%)	⬇️
src/models/CompositeModel/CompositeModel.jl	65.68% <66.66%> (-0.66%)	⬇️
...y_solvers/singlecomponent/saturation/saturation.jl	88.33% <78.57%> (-8.55%)	⬇️
... and 4 more

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