refact: rename getCpamix -> getCpaMixingRule

[asmfstatoil]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 7 lines in your changes missing coverage. Please review.

Project coverage is 41.07%. Comparing base (9556c8b) to head (477928f).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
...qsim/thermo/component/ComponentElectrolyteCPA.java	0.00%	2 Missing ⚠️
.../java/neqsim/thermo/component/ComponentSrkCPA.java	0.00%	2 Missing ⚠️
.../java/neqsim/thermo/component/ComponentUMRCPA.java	0.00%	2 Missing ⚠️
...va/neqsim/thermo/phase/PhaseElectrolyteCPAOld.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #1244   +/-   ##
=========================================
  Coverage     41.07%   41.07%           
  Complexity     6006     6006           
=========================================
  Files           719      719           
  Lines         68233    68233           
  Branches       8158     8158           
=========================================
  Hits          28024    28024           
  Misses        38528    38528           
  Partials       1681     1681           

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