made some minor refactorings and fixed a possible bug in the VideoPlaybackViewModel
updated the styles for the Filled state of the application to better fit the screen
fixed an issue with the save remote playlist view styling
improved to snapped audio playback view
added the winrt xaml toolkit and replace the usage of the Page BottomAppBar property with that of the CustomAppBar control
refactored some of the code regarding the VideoPlaybackViewModels and views by removing unused features (having actions instead of using plain methods) and added a specialized interface called IVideoPlayer
extracted a common.mocks assembly
added the SnappedVideoPlaybackViewModel/view and used it in the playback view model when snapped
updated/removed some old specs