update Player.js to enter React Drag and Drop

update track.js to enter React Drag and Drop sorting songs in playlist. This is one of the modified three files. These three files are:
Kaku-1.9.0/src/views/modules/Player.js ,
Kaku-1.9.0/src/views/components/shared/tracks.js  and 
Kaku-1.9.0/src/views/components/shared/track/track.js .
In order for the introduced changes to work, one should install: react-dnd and react-dnd-html5-backend. You also need to create an ItemTypes.js file in Kaku-1.9.0/src/views/components/shared/track/  .

src/views/modules/Player.js

@@ -193,7 +193,7 @@ Player.prototype.cleanupTracks = function(noUpdate) {
   }
 };
 
-Player.prototype.playNextTrack = function(forceIndex) {
+Player.prototype.playNextTrack = function(forceIndex,time) {
   if (this.disabled) {
     return;
   }
@@ -203,7 +203,8 @@ Player.prototype.playNextTrack = function(forceIndex) {
     // TODO
     // double check this randomIndex later
     this.randomIndex = this.trackIndex;
-    this.play(this.tracks[this.trackIndex]);
+    let currentTime = time || 0;
+    this.play(this.tracks[this.trackIndex], currentTime);
     return;
   }
 
@@ -236,7 +237,8 @@ Player.prototype.playNextTrack = function(forceIndex) {
   }
   else if (this.mode === 'all') {
     this.trackIndex = (this.trackIndex + 1) % this.tracks.length;
-    this.play(this.tracks[this.trackIndex]);
+    let currentTime = time || 0;
+    this.play(this.tracks[this.trackIndex], currentTime);
   }
 };