Bug fixes

Beta 5 release after Tripal Codefest @PAG XXVII 2019.

#3025507 by ndf: show a reload-this-page link on the mollie_return route
#3027245 by ndf: Do not apply authorize transition on new payments
#3019679 by ndf: Upgrade to Mollie API version 2
3025503 by ndf: implement every payment status: open, paid, failed, cancelled, expired
#3025505 by ndf: Improve test readability
#2976522 by Stefdewa: The onNotify function does not take into account that the payment was removed
#2908280 by ndf, casey, JeroenT, mollierobbert, Thomas Cys: Introduce middleware for handling of canceled payments

Changes since 8.x-2.0-beta0:

beta1 was reverted due to faulty commit.

• #d061294: Issue #3001930 by dpi: Require PHP7.1

- added Visual Tour to improve usability
- fixed configuration save issue for 'Enable login with SAML'

#3018470: Logout from auth server