refact: use PhaseType enum

[asmfstatoil]

do not use integer types to refer to phase type.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 17.76650% with 162 lines in your changes are missing coverage. Please review.

Project coverage is 33.63%. Comparing base (032c89c) to head (63a20b1).

Files	Patch %	Lines
src/main/java/neqsim/thermo/phase/PhaseUMRCPA.java	0.00%	21 Missing ⚠️
.../java/neqsim/thermo/phase/PhaseElectrolyteCPA.java	28.57%	13 Missing and 2 partials ⚠️
src/main/java/neqsim/thermo/phase/PhaseSrkCPA.java	38.09%	11 Missing and 2 partials ⚠️
...m/thermo/phase/PhaseSrkCPA_proceduralMatrices.java	0.00%	13 Missing ⚠️
...in/java/neqsim/thermo/phase/PhaseSrkCPAojAlgo.java	0.00%	13 Missing ⚠️
...va/neqsim/thermo/phase/PhaseElectrolyteCPAOld.java	0.00%	8 Missing ⚠️
.../main/java/neqsim/thermo/phase/PhaseCSPsrkEos.java	0.00%	7 Missing ⚠️
...ava/neqsim/thermo/component/ComponentGEUnifac.java	0.00%	6 Missing ⚠️
...va/neqsim/thermo/component/ComponentGEUniquac.java	0.00%	6 Missing ⚠️
...ation/processEquipment/mixer/StaticPhaseMixer.java	0.00%	5 Missing ⚠️
... and 25 more

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #929   +/-   ##
=========================================
  Coverage     33.63%   33.63%           
  Complexity     5125     5125           
=========================================
  Files           699      699           
  Lines         69791    69779   -12     
  Branches       7991     7991           
=========================================
- Hits          23474    23472    -2     
+ Misses        44841    44831   -10     
  Partials       1476     1476           

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[EvenSol]

This is a great improvement for readability of code.