Convert to our wrapper class for assertions

* Migrate assertions to Webmozart

PSR-12 compliancy

We'll use it in the new admin interface. For now, we just fix the old hook so that translations work for strings stored in dictionaries in the hooking module.

Create a new "configpage" hook for those modules that need to inject anything in the configuration page.

This allows us to change the signature of the hook, so that we pass it the \SimpleSAML\XHTML\Template object and then the hook can not only add data to be passed to the twig template, but also add its own translation domain. This was needed because many modules were putting their translations inside "core", and when moving those to the modules themselves, the new translation system cannot perform the translation because only the translations for the current module in use are loaded (in the config page, that's the core module). Therefore, we needed a way to get the Localization instance from the template, and a way to pass that to the hook so that the hook can register the translations for its own module.

Restructured frontpage. Moved auth sourc test into core. Improved the portal module (started using it on the frontpage). frontpage hook is adjusted to fit new frontpage structure, and links updated.

git-svn-id: https://simplesamlphp.googlecode.com/svn/trunk@1722 44740490-163a-0410-bde0-09ae8108e29a

git-svn-id: https://simplesamlphp.googlecode.com/svn/trunk@991 44740490-163a-0410-bde0-09ae8108e29a

git-svn-id: https://simplesamlphp.googlecode.com/svn/trunk@890 44740490-163a-0410-bde0-09ae8108e29a

git-svn-id: https://simplesamlphp.googlecode.com/svn/trunk@824 44740490-163a-0410-bde0-09ae8108e29a