Started working on HealthPickup
Implemented some methods in HealthPickup
MAde HealthPickup implement more interfaces
Added a enum to IGameObject
Created a WeaponPickup
Added support for HealthPickups in ICollidable
Implemented accept in HealthPickup
Added a get health method to pickup
Uppdated Spaceship to work with changes in ICollidable
Uppdated Asteroid to work with changes in ICollidable
Made pickup possible to remove.
Fixed a visit method in HealthPickup
Solved mergeconflict