New feature:

- `Sync on Editor save` has been implemented
- Now we can use the `Hidden file sync` and the `Customization sync` cooperatively.
- We can ignore specific plugins in Customization sync.
- Now the message of leftover conflicted files accepts our click.

Refactored:
- Parallelism functions made more explicit.
- Type errors have been reduced.

Fixed:
- Now documents would not be overwritten if they are conflicted.
- Some error messages have been fixed.
- Missing dialogue titles have been shown now.

src/JsonResolvePane.svelte

@@ -104,7 +104,6 @@
     ] as ["" | "A" | "B" | "AB" | "BA", string][];
 </script>
 
-<h1>Conflicted settings</h1>
 <h2>{filename}</h2>
 {#if !docA || !docB}
     <div class="message">Just for a minute, please!</div>