[Sailfish] Move "Now playing" item to controls dock

[RobertMe]

The "Now playing" item is always displayed in the pull down menu. This item is however only enabled when you are actually playing something. But in this case we also already show the controls dock. So it would probably be better to remove the "Now playing" item from the main pull down menu, and move it to the controls dock. Either as part of the push up menu (when there is no room left), or as button in the dock itself (when landscape is enabled (#36)).

When the user decides to close the controls dock we could still add the "Now playing" item in the main pull down menu, but in a more inaccessible place, between "Show controls" and "Media/Home", so the order becomes:
4. Show controls
3. Now playing
2. Media/Home

1. Keypad

[accumulator]

I have a experimental patchset where I was experimenting with putting the Now Playing page on the right of the BrowserPage and MainPage (and KodiPage to the left of the MainPage). There's still some issues with that though.

If you want to take NowPlaying out of the pulldown this could be an approach to consider