[City of Thebes] OilTrap_BP

<hr>#### OilOne of the four types of basic traps in City of Thebes, oil traps slow down the movement of any player running through them, excluding the player who laid it down.

Laying oil down in the area of effect of a smoke trap will start a fire. Laying oil over a mine will create a null zone that washes away existing traps and prevents further traps from being laid.

* OnDestroyed_EndEffects should connect up to the OnDestroyed node; the renderer isn't displaying the connection properly.