Py AST To CAST Merge

[titomeister]

Merging functionality of Python source to CAST generation which includes the variable ID algorithm for at least the basic Python constructs. The merging is done to help development of GrFN generation for Python programs. The current testing framework for Python to CAST is being reworked, and thus isn't included in this pull request.

[codecov[bot]]

Codecov Report

Merging #293 (b6fa346) into master (99a0ee8) will decrease coverage by 1.81%. The diff coverage is 20.37%.

@@            Coverage Diff             @@
##           master     #293      +/-   ##
==========================================
- Coverage   63.17%   61.35%   -1.82%     
==========================================
  Files          96       96              
  Lines       18936    19228     +292     
==========================================
- Hits        11962    11798     -164     
- Misses       6974     7430     +456     

Impacted Files	Coverage Δ
...lysis/CAST2GrFN/visitors/cast_to_agraph_visitor.py	18.18% <0.00%> (-35.48%)	:arrow_down:
...ates/program_analysis/PyAST2CAST/py_ast_to_cast.py	12.48% <20.23%> (+2.93%)	:arrow_up:
...ates/program_analysis/CAST2GrFN/model/cast/name.py	67.24% <100.00%> (-1.73%)	:arrow_down:
...program_analysis/CAST2GrFN/model/cast/class_def.py	71.05% <0.00%> (-3.95%)	:arrow_down:
...ates/program_analysis/CAST2GrFN/model/cast/dict.py	65.51% <0.00%> (-3.45%)	:arrow_down:
...ates/program_analysis/CAST2GrFN/model/cast/loop.py	65.51% <0.00%> (-3.45%)	:arrow_down:
...program_analysis/CAST2GrFN/model/cast/attribute.py	65.51% <0.00%> (-3.45%)	:arrow_down:
...program_analysis/CAST2GrFN/model/cast/subscript.py	65.51% <0.00%> (-3.45%)	:arrow_down:
...mates/program_analysis/CAST2GrFN/model/cast/set.py	61.22% <0.00%> (-2.05%)	:arrow_down:
... and 6 more

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