* Use SIMD to construct vertices into single XMM register.
* Use SIMD to construct origin and destination vectors from vertices.
* Deref 'navmesh_debug_camera_range' only once outside the render loop.
* Light code cleanup.
* Use SIMD to construct a Vector3D in a single instruction, instead of setting the vector fields individually.
* Store ConVar value as const bool outside loop.
* Slightly improved variable naming.
* Move AIN/NavMesh debug draw to ai_utility_shared.cpp.
* Use shift index + range for AIN debug draw.
* Added cvar for determining max distance between camera and tile (anything outside this range doesn't get draw).
