Add Play/Shuffle All for playlists (fixes #39)

Add Remove All from queue button on tvOS

tvOS/NowPlayingView.swift

@@ -68,9 +68,13 @@ struct NowPlayingView: View {
                                 VideoBanner(video: item.video)
                             }
                             .contextMenu {
-                                Button("Delete", role: .destructive) {
+                                Button("Remove", role: .destructive) {
                                     player.remove(item)
                                 }
+
+                                Button("Remove All", role: .destructive) {
+                                    player.removeQueueItems()
+                                }
                             }
                         }
                     }