Update to version 7 - Nuke weapon + extra tweaks

-Added a single-use nuke launcher! This will replace BFG spawns once you pick up a BFG, and can be obtained from the rare nuke barrels.

-Added a quick stone throw attack! Hit zoom to throw, will take half your blue meter. Hitting zoom with less than half charge will instead have Stone flip whoever is in front of her the double bird

-Added a slow passive charge to the blue meter

-Added two barrel variants:
-Guinness barrel, press use to regain 25 hp
-Nuke barrel, shoot to decimate surrounding monsters, press use to get a nuke launcher

-Fixed the sword idle sprite

-Added NPCs to the demo map, these can be talked to by pressing use (they're real basic but I wanted to get some of Stone's friends in the map)

-Added a radiation effect to the heavy rocket launcher

-Added a silver armor bonus, this will replace sword spawns once you pick up a sword and will give a backpack as well as protection slightly better than blue armor