w3lib-based url classes

[kmike]

An experiment: how a w3lib-based URL class could look like. Again, a minimal version.

[codecov[bot]]

Codecov Report

Merging #46 (2fd79d0) into url-page-inputs (5b0e889) will not change coverage. The diff coverage is 100.00%.

@@                Coverage Diff                @@
##           url-page-inputs       #46   +/-   ##
=================================================
  Coverage           100.00%   100.00%           
=================================================
  Files                   15        15           
  Lines                  344       355   +11     
=================================================
+ Hits                   344       355   +11     

Impacted Files	Coverage Δ
web_poet/_base.py	100.00% <100.00%> (ø)