Move package definition into setup.cfg file

[fizyk]

Move source code to src

Update build tools

[codecov]

Codecov Report

Merging #25 (9eabfc2) into master (3f75995) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #25   +/-   ##
=======================================
  Coverage   96.73%   96.73%           
=======================================
  Files           8        8           
  Lines         276      276           
=======================================
  Hits          267      267           
  Misses          9        9           

Flag	Coverage Δ
linux	89.85% <ø> (ø)
macos	96.01% <ø> (ø)

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Impacted Files	Coverage Δ
src/port_for/__init__.py	100.00% <ø> (ø)
src/port_for/_ranges.py	100.00% <ø> (ø)
src/port_for/api.py	96.25% <ø> (ø)
src/port_for/ephemeral.py	91.42% <ø> (ø)
src/port_for/exceptions.py	100.00% <ø> (ø)
src/port_for/store.py	94.23% <ø> (ø)
src/port_for/utils.py	100.00% <ø> (ø)

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