Revert "Merge branch 'master' of https://github.com/trefecta/blockade into collision_quadtree"

This reverts commit 0e38c4e9388a9eaabab11cc9ffd872cb25d5376e, reversing
changes made to 89e51b1445cffe6a0bf71469536e4b64d8ec4e79.
Collision Detection using Separating Axis Theorem complete. Needs optimization, as normals are calculated for every comparison, instead of once per mesh.