Simplify autoplay functionality.

Prevents all media in an entire carousel from simultaneously autoplaying in
some browsers. Changes the default autoplay value to true, and applies autoplay
configuration to all clips (whether from the gallery of most recent 'clip').

src/types.ts

@@ -617,7 +617,7 @@ export type MenuConfig = z.infer<typeof menuConfigSchema>;
  * Event viewer configuration section (clip, snapshot).
  */
 const viewerConfigDefault = {
-  autoplay_clip: false,
+  autoplay_clip: true,
   lazy_load: true,
   draggable: true,
   controls: {