Fix bug in GrFN generation

[dpdicken]

Fix:

• Strings appearing in lambdas within grfn
• Handling function calls when defined after call

[codecov[bot]]

Codecov Report

Merging #253 (9dcbed1) into master (d0a9c2b) will increase coverage by 0.13%. The diff coverage is 86.66%.

@@            Coverage Diff             @@
##           master     #253      +/-   ##
==========================================
+ Coverage   67.00%   67.13%   +0.13%     
==========================================
  Files          92       93       +1     
  Lines       17474    17593     +119     
==========================================
+ Hits        11708    11811     +103     
- Misses       5766     5782      +16     

Impacted Files	Coverage Δ
...s/CAST2GrFN/visitors/cast_function_call_visitor.py	85.71% <85.71%> (ø)
...analysis/CAST2GrFN/visitors/cast_to_air_visitor.py	42.63% <100.00%> (+0.86%)	:arrow_up:
...mates/program_analysis/GCC2GrFN/gcc_ast_to_cast.py	56.04% <100.00%> (ø)
automates/model_analysis/graph_manipulation.py	70.19% <0.00%> (-0.56%)	:arrow_down:
...rogram_analysis/CAST2GrFN/visitors/cast_visitor.py	91.66% <0.00%> (+8.33%)	:arrow_up:

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