Fix bugs

[shadycuz]

fixes #91, #92, #89

• Nested Attributes weren't handled correctly because the conversion of CF prop to TF args happened first
• Fixed failed to render argument stack_name
• Fixed edge cases when converting a CF type to a search string for finding the matching TF doc file

Added:

• Ability to handle "Endpoint" nested !GetAtt for RDS DB Instance

[codecov]

Codecov Report

Merging #93 (299526f) into develop (a265416) will decrease coverage by 0.31%.
The diff coverage is 76.92%.

@@             Coverage Diff             @@
##           develop      #93      +/-   ##
===========================================
- Coverage    73.73%   73.41%   -0.32%     
===========================================
  Files           16       16              
  Lines         1028     1042      +14     
  Branches       148      153       +5     
===========================================
+ Hits           758      765       +7     
- Misses         232      237       +5     
- Partials        38       40       +2     

Flag	Coverage Δ
unit	73.41% <76.92%> (-0.32%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/cf2tf/convert.py	54.25% <0.00%> (ø)
src/cf2tf/conversion/expressions.py	86.53% <72.00%> (-2.09%)	⬇️
src/cf2tf/terraform/code.py	94.20% <100.00%> (+0.65%)	⬆️

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