Read description for changes

- Moved popup css code to globals
- Invoked rust code with download stuff
- Invoke the main script with progress
- Move popup code to `main.tsx`
- Don't use Strict Mode
- Made sidebar downloads menu do something
- And more

src/types/DownloadProgress.ts

@@ -4,6 +4,6 @@ export class DownloadProgress {
   constructor (
     public version: LauncherVersion,
     public progress: number,
-    public done: boolean
+    public failed: boolean
   ) {}
 }