Add comments for GameManager
Add a tool to debug render entities.
Update the tool to debug physical entities.
Add comments for EntityManager, PhysicalEntity, and RenderEntity.
Fix physical collisions
Add ContactListener (class) to manage actions when detect collisions.
Add PhysicalType (enum) to know the type a physical entity (dino, ground, flower...).
Update PhysicalEntity constructor to force to have a type for each physical entity.
Update jump : possible only if the dino is in contact of something