Add cookie consent option for GDPR compliance

[ajnyga]

@NateWr

Issue: pkp/pkp-lib#3624

third time the charm? Closed #2036

[ajnyga]

so it is failing almost in the same place here: https://github.com/pkp/pkp-lib/blob/master/tests/WebTestCase.inc.php#L129

The earlier versions failed on row 127. The commits are basically identical so no idea why it fails on that row now. I can not even see how the changes would affect the login?

The only thing it does concerning the login is that it adds a cookie consent (or actually privacy policy consent) box in the login form and userName is assigned to the login form only if a session exists. BUT this all happens only if the new session_limit setting is On in config.inc.php and I can not see how this would be the case in the tests?

[ajnyga]

@NateWr if you want to test this here are the branches:
OJS: #2106
PKP-LIB: pkp/pkp-lib#4015

I do not understand the test failure