Document and Refactor the Feature Extraction

[EagleoutIce]

This makes the dataflow information available!

[codecov]

Codecov Report

Attention: 68 lines in your changes are missing coverage. Please review.

Files	Coverage Δ
src/statistics/features/feature.ts	100.00% <ø> (ø)
src/statistics/features/supported/control-flow.ts	100.00% <100.00%> (ø)
...rc/statistics/features/supported/used-functions.ts	100.00% <100.00%> (ø)
src/statistics/index.ts	100.00% <100.00%> (ø)
src/statistics/meta-statistics.ts	100.00% <100.00%> (ø)
src/statistics/output/statistics-file.ts	60.00% <100.00%> (ø)
src/util/objects.ts	100.00% <100.00%> (ø)
src/statistics/output/print-stats.ts	29.72% <0.00%> (ø)
src/statistics/post-process/post-process-output.ts	26.78% <0.00%> (ø)
src/statistics/features/supported/used-packages.ts	45.83% <25.00%> (ø)
... and 7 more

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