* Migrate email utils to non-static

* Migrate http utils to non-static

* Migrate net utils to non-static

* Migrate random utils to non-static

* Migrate system utils to non-static

* Migrate time utils to non-static

* Migrate xml utils to non-static

* Upgrade notes

* Update test-framework

* Fix tests

Convert to our wrapper class for assertions

* Remove deprecated classes

* Remove support for certificate fingerprints

* Remove many deprecated methods and pieces of code

* Remove SAML1.1/Shib1.3 support

* Remove many superfluous annotations

* Update unit test to work with new PHPunit

Closes #1268 
Closes #1020 
Closes #431 
Closes #167 
Closes #151 

* Migrate assertions to Webmozart

* Raise minimum PHP version to 7.0

* Remove tests pre-PHP 7.2

* Upgrade dev dependencies

* Ignore tests for deprecated class

* Add typehints; not touching public API

* Remove none-array replacements-param; old behaviour from pre-1.4 release

* Psalm fixes

* Add upgrade notes

* PSR-12

PSR-12 compliancy

The NoPassive constructor requirest the first parameter to be a constant indicating whether the error is due to the requester or the responder. Therefore, passing only an error message is not a valid way to create a NoPassive object anymore.

Closes https://github.com/simplesamlphp/simplesamlphp/issues/962

Fix build as a side effect. When vimeo/psalm tries to resolve dependencies, it now fails with this.

Migrate the logout handlers to namespaces, change the base abstract class to be an interface instead.

Move SimpleSAML_Utilities:: redirectTrustedURL() to SimpleSAML\Utils\HTTP:: redirectTrustedURL() and deprecate the former.

Manually remove idp-ssotime data from the session on the IdP, per association (instead of using SimpleSAML_Session::DATA_TIMEOUT_LOGOUT).