Added walk sound and weapon custom animations!

I made some new things, now all the shops have a custom bg and each weapon have a custom animation. Also, the weapons now have a custom locker and a new potentiator has been added, the wing, it makes you faster. Have fun with the new update. PD: If you had the game before this update im sorry but you will lose your skins and hats, I recomend you delete your data to avoid bugs, because I changed the skins & hats system. Also I balanced prices. Remember if you find any bugs you can post a comment to report them!