Change project structure

[gyermolenko]

fixes #264
Everything important and src-like moved to patterns folder .

• pattern scripts themselves were not modified, only moved.
• A few import fixes in tests.
• Created setup.py for consistent imports. It doesn't change how scripts in patterns folder operate

[codecov-io]

Codecov Report

Merging #265 into master will decrease coverage by 40.13%.
The diff coverage is 93.33%.

@@             Coverage Diff             @@
##           master     #265       +/-   ##
===========================================
- Coverage   97.67%   57.54%   -40.14%     
===========================================
  Files          61       62        +1     
  Lines        2238     2240        +2     
===========================================
- Hits         2186     1289      -897     
- Misses         52      951      +899

Impacted Files	Coverage Δ
patterns/structural/mvc.py	0% <ø> (ø)
patterns/behavioral/iterator.py	0% <ø> (ø)
patterns/behavioral/state.py	87.8% <ø> (ø)
patterns/dft/setter_injection.py	100% <ø> (ø)
patterns/behavioral/template.py	0% <ø> (ø)
patterns/behavioral/catalog.py	0% <ø> (ø)
patterns/behavioral/memento.py	0% <ø> (ø)
patterns/other/hsm/hsm.py	77.35% <ø> (ø)
patterns/behavioral/strategy.py	96.29% <ø> (ø)
patterns/behavioral/chain.py	0% <ø> (ø)
... and 88 more

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