torrent priority and piece state fix

graphql/sources/torrent_mutation.graphql

@@ -0,0 +1,18 @@
+type TorrentDaemonMutation {
+  validateTorrent(filter: TorrentFilter!): Boolean! @resolver
+  setTorrentPriority(
+    infohash: String!
+    file: String
+    priority: TorrentPriority!
+  ): Boolean! @resolver
+  cleanup(files: Boolean, dryRun: Boolean!): CleanupResponse! @resolver
+}
+
+type CleanupResponse {
+  count: Int!
+  list: [String!]!
+}
+
+type DownloadTorrentResponse {
+  task: Task
+}