-Added ability to save playlist as remote playlist link rather than storing it in database.

-Added LeakCanary as part of debug build.
-Modified bookmark list to show both remote and local playlists.
-Removed ability to save channel items as local playlist, in favor of subscribe.

app/src/debug/java/org/schabi/newpipe/DebugApp.java

@@ -4,6 +4,7 @@ import android.content.Context;
 import android.support.multidex.MultiDex;
 
 import com.facebook.stetho.Stetho;
+import com.squareup.leakcanary.LeakCanary;
 
 public class DebugApp extends App {
     private static final String TAG = DebugApp.class.toString();
@@ -18,6 +19,13 @@ public class DebugApp extends App {
     public void onCreate() {
         super.onCreate();
 
+        if (LeakCanary.isInAnalyzerProcess(this)) {
+            // This process is dedicated to LeakCanary for heap analysis.
+            // You should not init your app in this process.
+            return;
+        }
+        LeakCanary.install(this);
+
         initStetho();
     }