Item and Weapon base classes

[hogsy]

Weapon should inherit from Item class.

Item handles world presence + pickup.

Weapon includes projectile handling.

• [x] Item class should pass back boolean that will indicate whether or not it can be selected from the inventory
• [x] Need to implement parachute item
• [x] Pigs should be spawned with the parachute item and it should be immediately equipped
• [x] How is inventory going to work when occupying a vehicle? Should the vehicle provide it's own inventory, or should we update the inventory of the pig, then restore after? Vehicles should have their own inventory separate to the pig
• [x] Pigs should be spawned positioned at the highest point of the map
• [x] Consider how we can handle items that impact the pigs movement when equipped (e.g. Jetpack / Parachute)

[hogsy]

Closing this as the goal of the ticket has basically been fulfilled.