refact: mixingrule getMixingRules

[asmfstatoil]

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 80.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 41.06%. Comparing base (59c83bb) to head (dd6e39f).

Files with missing lines	Patch %	Lines
.../java/neqsim/thermo/mixingrule/CPAMixingRules.java	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #1242   +/-   ##
=========================================
  Coverage     41.05%   41.06%           
+ Complexity     6008     6003    -5     
=========================================
  Files           719      719           
  Lines         68281    68233   -48     
  Branches       8174     8158   -16     
=========================================
- Hits          28036    28018   -18     
+ Misses        38557    38534   -23     
+ Partials       1688     1681    -7     

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