Stacking Damage Indicators

A very simple and optimized module that shows players how much damage they've done to enemies. The damage indicator will stack as more damage is applied until no damage has been applied in 1.5 seconds at which point the indicator will disappear.

There's a bug where the damage indicator will stay visible for longer than expected if the player you damaged gets damaged by other players within that 1.5 second time frame. Essentially, once you damage a player the damage indicator will stay visible until the target hasn't been damaged by anybody for 1.5 seconds. I may or may not get around to fixing this, as I took a quick look at it and realized it's actually going to be tough to fix given the way I implemented this.