Default AK-47 RNG mix

Adds a little variety to the vanilla AK. In a similar fashion to my old pump shotgun mix (that needs to be updated), I have mixed up the three AK skins the game now has: the classic one, the Global Offensive one, and the one that was hidden in CS:GO beta files and ultimately unused. Uses Ellie's "True RNG": view and world textures match, and can change between maps. This replaces only the normal AK skin. Those preset to use the extra skins in the maps (such as the CSGO ones in the Last Stand campaign) will not be altered. This is a retexture! This means it works with reanimations!