Added some materials for NPCs.
Added Pursuit steering behavior.
Updated NPC prefab.
Fixed stuff that was giving tons of warnings.  Left a whole bunch of commented-out lines that should probably be removed.
Merge branch 'feature/steering' into develop
The "occasional" might have been caused by prefabs attempting to load missing scripts. I removed Cursor prefab which had one, as well as a bunch of other outdated prefabs.