use zipstreamer via composer

3rdparty @ 70d9c409

-Subproject commit 0f862d433ad146ebca97e356c703369777c2a30f
+Subproject commit 70d9c4096e767b4103960ffad96b87e3e511ee61

lib/private/files.php

@@ -40,9 +40,6 @@
  *
  */
 
-// TODO: get rid of this using proper composer packages
-require_once 'mcnetic/phpzipstreamer/src/ZipStreamer.php';
-
 use OC\Lock\NoopLockingProvider;
 use OCP\Lock\ILockingProvider;