Update v0.8.1

Change list:

• Settings menu now working
• Pickup button now shows for items after attempting a pickup(inventory full)
• Falling off the map at the world edge
• Can now build in the game, this was not working
• Build UI will no longer start with all 3 lists of buildings
• pickup animation
• Rifle equip animation
• Rifle unequip animation
• Forward momentum when swinging weapon/melee
• Left mouse button now attacks and player faces the mouse position
• Damage image screen now shows after 50% health damage
• Idle animation has been changed