Added support for Days Gone (PS4)

UE Viewer got support for the Days Gone video game (Playstation 4). In order to open its files, you should choose "Days Gone" from dropdown list of startup window, or use command line option -game=daysgone.

Of course you should also select "PS4" platform, otherwise you'll see either crash when UE Viewer loads any texture, or textures will appear as garbage.

Discussion.