styled progress bar; moved to correct position

still todo: show time and lenght as formatted number
refactor MusicPlayer.qml into components

LenaPi/models/MusicModel.cpp

@@ -62,13 +62,16 @@ void MusicModel::stopMusic()
 {
     if(mIsPlaying){
         mIsPlaying = false;
+        emit isPlayingChanged();
+
         mHasNext = false;
         mHasPrevious = false;
-        mCurrentMediaItemProgress = 0.0;
-        emit progressChanged();
         emit hasNextChanged();
         emit hasPreviousChanged();
-        emit isPlayingChanged();
+
+        mCurrentMediaItemProgress = 0.0;
+        emit progressChanged();
+
         emit stop();
     }
 }