[pytest_selenium.py] Date input

* Added possibility to enter the date as tuple (Y, M, D)
* In addition to this, possibility to set the read-only date input was added
* And to support all of this, a function to get all attributes from element has been added
wip

Revert "[pytest_selenium.py] Date input"

This reverts commit 34b7615791439bb780f322b67f61ddf48be2269c.