Now using TextureAtlasses for loading textures.
Only background remains outside for now as it's unclear what we'll do with those.
Done some work on the buttons so they now can have sprites as their look instead of having them as coloured rectangles. This needs to be finished, right now if you don't give it a sprite it'll be just the text with an invisible rectangle of 50x50 for touch. I need to change it so that we have a default button sprite if no sprite is passed.