First attempt at AABB physics
Fix rogue comparison
Fix gravity
Keep items on the ground
Collision responses
Updated for the new immutable CollisionVolumes

Signed-off-by: Dalton Pelc <daltonjpelc@gmail.com>
Updated for BlockMaterial method change getBoundingArea -> getVolume

Signed-off-by: Dalton Pelc <daltonjpelc@gmail.com>