Tag directory error locator should check if weapons have projectiles referenced in their triggers.

[ShellyHerself]

AI characters don't like it when there is no projectile to use inside a weapon tag. It will give this error in sapien if this is the case. EXCEPTION halt in \halopc\haloce\source\memory\data.c,#495: tag instance index #65535 (0xffffffff) is unused or changed