Difficulty Settings, the Game Over Screen, New Animations!

The game now features new attack animations for both the player and the enemies, an animated Game Over screen, a Difficulty setting sub-menu and many "under the hood" improvements. Game systems are mostly done, so the content will start appearing faster.

I've had a major emergency in that updating Unity destroyed a lot of the project, of which the most painful was the animation system. I've redone it all and I'm back on track again, thankfully.