Add more units

[EvenSol]

Improve unit handeling by adding a unit class.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 79.74684% with 16 lines in your changes are missing coverage. Please review.

Project coverage is 35.03%. Comparing base (3e034e0) to head (cfa8be5).

Files	Patch %	Lines
src/main/java/neqsim/Units.java	80.00%	8 Missing ⚠️
...c/main/java/neqsim/thermo/system/SystemThermo.java	81.81%	4 Missing ⚠️
src/main/java/neqsim/thermo/phase/Phase.java	71.42%	2 Missing ⚠️
src/main/java/neqsim/util/unit/PressureUnit.java	85.71%	1 Missing ⚠️
...rc/main/java/neqsim/util/unit/TemperatureUnit.java	66.66%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #983      +/-   ##
============================================
+ Coverage     34.74%   35.03%   +0.29%     
- Complexity     5296     5332      +36     
============================================
  Files           700      701       +1     
  Lines         69600    69662      +62     
  Branches       8001     8005       +4     
============================================
+ Hits          24184    24408     +224     
+ Misses        43929    43765     -164     
- Partials       1487     1489       +2     

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