Temporarily removed static objects. Replaced IEntity with IUpdateable and added Update List. Removed ItemManager class.
Removed Thing manager (replaced by update list).
Removed weapon manager (replaced by render list, update list and collision manager).
Removed Bullet manager, refactoring weapons. Temporarily removed all weapons beside rocket luncher.
Added scene entity and scene incorporated into level class.
Rebuilding collision detection on level walls from scratch - in progress.