Add Deluge widget

- Create semi-generic jsonrpc proxy handler
- Refactor NZBGet to use jsonrpc proxy handler

closes #190

src/widgets/components.js

@@ -7,6 +7,7 @@ const components = {
   bazarr: dynamic(() => import("./bazarr/component")),
   changedetectionio: dynamic(() => import("./changedetectionio/component")),
   coinmarketcap: dynamic(() => import("./coinmarketcap/component")),
+  deluge: dynamic(() => import("./deluge/component")),
   docker: dynamic(() => import("./docker/component")),
   emby: dynamic(() => import("./emby/component")),
   gluetun: dynamic(() => import("./gluetun/component")),