Add support for alternative CDN when downloading packages

Since the actual download URL is returned by the Thunderstore API as a
redirect, signal the API with a query parameter that an alternative CDN
is preferred.

Refs TS-2003

Author: anttimaki

Diff for: src/model/ThunderstoreVersion.ts

@@ -1,6 +1,7 @@
 import Mod from './Mod';
 import VersionNumber from './VersionNumber';
 import ReactiveObjectConverterInterface from './safety/ReactiveObjectConverter';
+import CdnProvider from '../providers/generic/connection/CdnProvider';
 
 export default class ThunderstoreVersion extends Mod implements ReactiveObjectConverterInterface {
 
@@ -35,10 +36,10 @@ export default class ThunderstoreVersion extends Mod implements ReactiveObjectCo
     }
 
     public getDownloadUrl(): string {
-        return this.downloadUrl;
+        return CdnProvider.addCdnQueryParameter(this.downloadUrl);
     }
 
     public setDownloadUrl(url: string) {
         this.downloadUrl = url;
     }
-}
+}