Analyze submodules (part 3)

[matsoftware]

Implement recursive reporting and graphic analysis of submodules inside Frameworks.

[codecov]

Codecov Report

Merging #27 into master will increase coverage by 0.18%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #27      +/-   ##
==========================================
+ Coverage   98.19%   98.37%   +0.18%     
==========================================
  Files           7        8       +1     
  Lines         609      679      +70     
==========================================
+ Hits          598      668      +70     
  Misses         11       11              

Impacted Files	Coverage Δ
swift_code_metrics/_report.py	98.50% <ø> (ø)
swift_code_metrics/_analyzer.py	98.82% <100.00%> (ø)
swift_code_metrics/_graph_helpers.py	92.53% <100.00%> (ø)
swift_code_metrics/_graphs_presenter.py	100.00% <100.00%> (ø)
swift_code_metrics/_graphs_renderer.py	100.00% <100.00%> (ø)
swift_code_metrics/_helpers.py	100.00% <100.00%> (ø)
swift_code_metrics/_metrics.py	100.00% <100.00%> (ø)

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