Add Apprise support (#124)

code/Executable/appsettings.Development.json

@@ -122,5 +122,14 @@
     "ON_DOWNLOAD_CLEANED": true,
     "API_KEY": "",
     "CHANNEL_ID": ""
+  },
+  "Apprise": {
+    "ON_IMPORT_FAILED_STRIKE": true,
+    "ON_STALLED_STRIKE": true,
+    "ON_SLOW_STRIKE": true,
+    "ON_QUEUE_ITEM_DELETED": true,
+    "ON_DOWNLOAD_CLEANED": true,
+    "URL": "http://localhost:8000",
+    "KEY": ""
   }
 }