Additions:

• added clubs
• added swords of copper, bronze and iron
• added a functional mob spawner, which spawns random mobs in a given duration of time
• using weapons cannot be non-stop, so there is a recharge cooldown, shown in a bar below the mouse pointer

Changes:

• each animal texture now shows the legs on the other side when moving
• mobs disappear after a certain amount of time if not attacked
• removed the debug shortcuts for spawning mobs