Add Apprise support (#124)

code/Executable/appsettings.json

@@ -105,5 +105,14 @@
     "ON_DOWNLOAD_CLEANED": false,
     "API_KEY": "",
     "CHANNEL_ID": ""
+  },
+  "Apprise": {
+    "ON_IMPORT_FAILED_STRIKE": false,
+    "ON_STALLED_STRIKE": false,
+    "ON_SLOW_STRIKE": false,
+    "ON_QUEUE_ITEM_DELETED": false,
+    "ON_DOWNLOAD_CLEANED": false,
+    "URL": "",
+    "KEY": ""
   }
 }