Override release grab modal

New: Option to override release and grab
New: Option to select download client when multiple of the same type are configured

(cherry picked from commit 07f0fbf9a51d54e44681fd0f74df4e048bff561a)

frontend/src/DownloadClient/DownloadProtocol.ts

@@ -0,0 +1,7 @@
+enum DownloadProtocol {
+  Unknown = 'unknown',
+  Usenet = 'usenet',
+  Torrent = 'torrent',
+}
+
+export default DownloadProtocol;