* 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

* 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

* 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 

PSR-12 compliancy

Option to support Apache CGI in combination with custom config directory.

Moved logic pertaining to finding configdir to central location, added ability to set via environment variable

Move SimpleSAML_Utilities::resolveCert() to SimpleSAML\Utils\Config::getCertPath() and deprecate the former.

Move SimpleSAML_Utilities::getSecretSalt() to SimpleSAML_Utils_Config::getSecretSalt(). Deprecate the former and stop using it.