iOS: MoreViewController now implements IMobileOptionsMenuView.
Changed the way MobileOptionsMenuPresenter works.
Some code cleanup (removed redundant code).

Related to issue #409.
The MobileLibraryBrowserPresenter now pushes another MLBP view when necessary.
A few bug fixes in loading audio files from database for the MobileLibraryBrowserPresenter.
MobileNavigationManager now requires a query for creating the MLBP view.
Added InvokeOnMainThread in all UIViewControllers.

Related to issue #408 and issue #409.