Coding refactoring

[eniocc]

In this request I made a lot of changes in the file DSS.py. All code were break in new classes each one with specific responsabilities. I added a folder named samples to help new enthusiasts with this beautiful and usefull module for OpenDSS.

[codecov-commenter]

Codecov Report

Merging #1 (bcc3a1a) into master (6135830) will increase coverage by 20.30%.
The diff coverage is 53.50%.

@@             Coverage Diff             @@
##           master       #1       +/-   ##
===========================================
+ Coverage   34.02%   54.33%   +20.30%     
===========================================
  Files           3      217      +214     
  Lines        3350     3764      +414     
  Branches        6       55       +49     
===========================================
+ Hits         1140     2045      +905     
+ Misses       2207     1707      -500     
- Partials        3       12        +9     

Impacted Files	Coverage Δ
src/py_dss_interface/DSS.py	84.74% <ø> (+51.33%)	⬆️
...rc/py_dss_interface/models/ErrorInterface/Error.py	0.00% <0.00%> (ø)
...y_dss_interface/models/ErrorInterface/ErrorCode.py	0.00% <0.00%> (ø)
...y_dss_interface/models/ErrorInterface/ErrorDesc.py	0.00% <0.00%> (ø)
...py_dss_interface/models/ErrorInterface/__init__.py	0.00% <0.00%> (ø)
src/py_dss_interface/models/Bridge.py	24.48% <24.48%> (ø)
...y_dss_interface/models/CapControls/CapControlsF.py	28.94% <28.94%> (ø)
src/py_dss_interface/models/Base.py	32.81% <32.81%> (ø)
.../py_dss_interface/models/CktElement/CktElementS.py	37.03% <37.03%> (ø)
src/py_dss_interface/models/Monitors/MonitorsI.py	37.50% <37.50%> (ø)
... and 422 more

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