Added tag system to entities and two types of entity
It's going to help see what kind of entity and entity is
Added Sprite that will be used to display images
Added EntityBag which will be an entity type that contains entities

Signed-off-by: BunnyRabbit2 (Lewis Storey) <iamlewisstorey@yahoo.com>
Finished EntityBag code and changed GameScreen to use it

Signed-off-by: BunnyRabbit2 (Lewis Storey) <iamlewisstorey@yahoo.com>