Reorganize files

[lucdion]

Cleanup the directory structures.

[codecov-io]

Codecov Report

Merging #102 into master will decrease coverage by 0.02%.
The diff coverage is 88.02%.

@@            Coverage Diff             @@
##           master     #102      +/-   ##
==========================================
- Coverage   89.96%   89.93%   -0.03%     
==========================================
  Files          30       31       +1     
  Lines        6067     6069       +2     
==========================================
  Hits         5458     5458              
- Misses        609      611       +2

Impacted Files	Coverage Δ
Sources/Impl/PinLayoutImpl+Coordinates.swift	87.65% <ø> (ø)
Sources/Impl/Percent.swift	100% <ø> (ø)
Sources/Impl/Coordinates.swift	100% <ø> (ø)
Sources/Impl/UIView+LTR.swift	69.23% <ø> (ø)
Sources/Impl/TypesImpl.swift	92.59% <ø> (ø)
Sources/PinLayout.swift	100% <ø> (ø)	⬆️
Sources/Impl/PinLayoutImpl+Warning.swift	87.87% <ø> (ø)
Sources/Impl/PinLayoutImpl+Relative.swift	88.05% <ø> (ø)
Sources/Impl/PinLayoutImpl.swift	82.8% <ø> (ø)
Sources/Impl/PinLayoutImpl+Layouting.swift	88.02% <88.02%> (ø)
... and 1 more

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