AABB Performance Optimization - Let's Make a Physics Engine [18]

Using Axis Aligned Bounding Boxes to do all initial collision checks before using the Separating Axis Theorem to get an increase in performance. Source code (github): Flat: https://github.com/twobitcoder101/Flat FlatPhysics: https://github.com/twobitcoder101/FlatPhysics-part-18