Fix several bugs in saml:NameIDAttribute authproc filter & raise coverage

* 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

Start migrating to SAML2 getters/setters

This reverts commit ef36c5fd.

All a bit too involved right before a planned release.

Also, convert to PSR-2 where that was still lacking in these files.

also add some tests ;)

Now we are finally using the 2.x branch of the SAML2 library, which was also migrated to use namespaces. Even though the library provides an autoloader that allows loading the classes with the old names using class aliasing, we need to do the migration in one commit (at least for most part of it). This is due to the way SimpleSAMLphp checks data types, using inheritance to check objects agains abstract or more general classes. Even though class aliasing works, there's no way to replicate those relationships, and type checks that use the old class names will fail because the aliases are virtually new classes that don't inherit from others.

git-svn-id: https://simplesamlphp.googlecode.com/svn/trunk@2679 44740490-163a-0410-bde0-09ae8108e29a

This filter can create an attribute from the NameID we receive in
the authentication response.

git-svn-id: https://simplesamlphp.googlecode.com/svn/trunk@2548 44740490-163a-0410-bde0-09ae8108e29a