* 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).
Rare crash when the sqvm tries to look for an animation sequence on a missing prop_dynamic model (mdl/error.rmdl doesn't support animations), its purely to indicate there is a problem).
