Issue #2782479 by chaitanya17, elachlan: Replace deprecated usage of \Drupal::url with Url::fromRoute

Issue #1395184 by Berdir, mcotelo, Arla, cosmicdreams, wodenx, mpdonadio, vimalgoradiya, valery86, elvis2: Forms with AJAX trigger "CAPTCHA session reuse attack detected." error

Issue #2707509 by mkdok: Can't see Image CAPTCHA image unless enable Node permission:  [x] View published content

Issue #2548049 by rashid_786, wundo: Document all arguments to hook_captcha() and fix broken documentation

Issue #2548049 by rashid_786, wundo: Document all arguments to hook_captcha() and fix broken documentation

Issue #2558243 by Berdir, tim.plunkett, hass, wundo: Use a FormElement plugin instead of the deprecated hook_element_info()

Issue #2558243 by Berdir, tim.plunkett: Use a FormElement plugin instead of the deprecated hook_element_info()

Remove Captcha challenge: none and use status() to en/disable Captchas

Fix test for multiple forms on single page

Fix schema errors

Switched to Drupal_TI

Cache clearing is currently broken

Speed up module installation by trusting our own data