AABB Collision Resolution

[HeadMerchant]

The current Axis-Aligned Bounding Box implementation doesn't properly resolve collisions. A more robust implementation should offer:

• normal vector of the collision edge (used for negating/reflecting velocity perpendicular to the surface)
• properly position colliding objects (objects that can move should be just barely touching)

In addition, if we plan on having fast-moving projectiles later on, I recommend looking into continuous collision detection via swept AABBs, but let's focus on getting regular collision resolutions working first.

Recommended reading: https://noonat.github.io/intersect/

[HeadMerchant]

Also, I can't self-assign this issue, but I'll take it.

[larryoatmeal]

Yes, this would be great, it is similar to #11, might want to see if @CometsTech has some thoughts on it as well