Support for multiple selection of tracks

[4ngelf]

Hello, this is a great app. I quickly decided to use it as my main music player at the moment.

But I find creating playlists annoying because I must add songs one by one. So my suggestion is to allow selection of multiple of items in the tracks tab (and then add them to a selected playlist).
That, or make a dialog to select and add multiple songs to a particular playlist in the playlists tab.