Refactor getBoolean/getOptionalBoolean

lib/SimpleSAML/Configuration.php

lib/SimpleSAML/Database.php

lib/SimpleSAML/Error/Error.php

lib/SimpleSAML/IdP.php

lib/SimpleSAML/Locale/Language.php

lib/SimpleSAML/Metadata/SAMLBuilder.php

lib/SimpleSAML/Metadata/Signer.php

lib/SimpleSAML/Module.php

lib/SimpleSAML/Session.php

lib/SimpleSAML/SessionHandler.php

lib/SimpleSAML/SessionHandlerPHP.php

lib/SimpleSAML/Utils/Config/Metadata.php

lib/SimpleSAML/Utils/HTTP.php

lib/SimpleSAML/XHTML/IdPDisco.php

lib/SimpleSAML/XHTML/Template.php

modules/admin/lib/Controller/Config.php

modules/admin/lib/Controller/Federation.php

modules/core/lib/Auth/Process/ExtendIdPSession.php

modules/core/lib/Auth/Process/ScopeAttribute.php

modules/core/lib/Auth/UserPassBase.php