* For descriptions, check error code existance in descriptions rather than in titles

* Prepare error code constants

* Propagate error codes through the codebase

* Make error codes more extendable

* Fix spell check errors from CICD

* Fix phpcs errors

* Move from static to instance methods

---------

Co-authored-by: Marko Ivančić <marko.ivancic@srce.hr>
Co-authored-by: Tim van Dijen <tvdijen@gmail.com>

* Migrate array utils to non-static

* Migrate attribute utils to non-static

* Migrate auth utils to non-static

* Migrate config utils to non-static

* Migrate crypto utils to non-static

* Raise coverage

* Fix rebase issue

This was available for the memcache extension, but when we moved to memcached it went away since the API is different and required changes. The issue with persitence in memcached is that persistent connections require a common identifier, which shouldn't be fixed. Therefore, we need to change a bit the way the memcache servers are configured in config.php as well.

* 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

Fixes for the remainder of lib/SimpleSAML