[WIP] Move Mink toward 2.0

[stof]

this is the updated version of https://github.com/minkphp/Mink/pull/427 targetting the master branch.

See https://github.com/minkphp/Mink/issues/415 for the goals of the change

[codecov[bot]]

Codecov Report

Merging #542 (3b01db6) into master (f0ae96a) will increase coverage by 1.14%. The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master     #542      +/-   ##
============================================
+ Coverage     98.43%   99.58%   +1.14%     
+ Complexity      351      330      -21     
============================================
  Files            24       23       -1     
  Lines          1024      959      -65     
============================================
- Hits           1008      955      -53     
+ Misses           16        4      -12     

Impacted Files	Coverage Δ
src/Selector/NamedSelector.php	100.00% <ø> (ø)
src/Selector/SelectorsHandler.php	100.00% <ø> (ø)
src/Driver/CoreDriver.php	100.00% <100.00%> (ø)
src/Element/Element.php	100.00% <100.00%> (+14.28%)	:arrow_up:
src/Element/ElementFinder.php	100.00% <100.00%> (ø)
src/Element/NodeElement.php	98.90% <100.00%> (ø)
src/Exception/ElementHtmlException.php	100.00% <100.00%> (ø)
src/Exception/ElementNotFoundException.php	100.00% <100.00%> (ø)
src/Exception/ExpectationException.php	96.96% <100.00%> (+12.87%)	:arrow_up:
src/Session.php	100.00% <100.00%> (ø)

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