* Drop ext-intl in favour of a polyfill

This reverts a few minor things that were already rolled out in master
in all my enthousiasm

Fixes #1899

Co-authored-by: Simon Jarrett <simonjarrett@capuk.org>

Only 'admin' is enabled additionally, 'core' and 'saml' are enabled by default in \SimpleSAML\Module::isModuleEnabled().

* Fix static call for non-static method in bin/initMDSPdo.php

* Fix phpcs

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Co-authored-by: Marko Ivančić <marko.ivancic@srce.hr>