Remove usage of legacy OC_Appconfig

apps/files/index.php

apps/files_encryption/ajax/adminrecovery.php

apps/files_encryption/lib/helper.php

apps/files_encryption/lib/session.php

apps/files_encryption/lib/util.php

apps/files_encryption/settings-admin.php

apps/files_encryption/settings-personal.php

apps/files_encryption/tests/share.php

apps/files_external/lib/google.php

apps/files_sharing/lib/api.php

apps/files_sharing/public.php

apps/files_trashbin/lib/trashbin.php

apps/files_versions/lib/versions.php

lib/private/cache/fileglobal.php

lib/private/setup.php

lib/private/util.php

remote.php