vimeo: use api to get video info, direct download if possible (#612)

src/modules/sub/utils.js

@@ -44,3 +44,17 @@ export function cleanHTML(html) {
     clean = clean.replace(/\n/g, '');
     return clean
 }
+
+export function merge(a, b) {
+    for (const k of Object.keys(b)) {
+        if (Array.isArray(b[k])) {
+            a[k] = [...(a[k] ?? []), ...b[k]];
+        } else if (typeof b[k] === 'object') {
+            a[k] = merge(a[k], b[k]);
+        } else {
+            a[k] = b[k];
+        }
+    }
+
+    return a;
+}