api/stream: implement itunnel transplants

api/src/misc/utils.js

@@ -29,3 +29,7 @@ export function splitFilenameExtension(filename) {
         return [ parts.join('.'), ext ]
     }
 }
+
+export function zip(a, b) {
+    return a.map((value, i) => [ value, b[i] ]);
+}