Update 6

Features Balancing Fixes Misc
 * Music for Frozen City and the Crown Vault.
 * New character walk animations.
 * New enemy walk animations.
 * A very basic early version of the Frozen City boss.
 * Art for the snowbots.
 * No melee for snowbots carrying cars.
 * Some I.D.P.D. spawn tweaking.
 * Snow tanks now have a max range, and a longer startup time before they fire.
 * Less accuracy for the minigun.
 * Various tiny fixes.
 * Fixed the Scrapyard rain to also fall on top of the level.
 * New color for Robot's B-skin and energy weapons.
 * Some preparation for the crowns.
 * New sniper gun.
 * Some extra tips during level load.