QOL: Battle effects (transparency option)

[kelevra13]

I like this. After repeatedly farming alliance raid roulette recently, and getting copied factory a lot, I kinda want to see where some of the bosses are facing to know where some of their attacks will hit (for example, 9S' forehind and flank cannons). I mean, it's not impossible to determine where they're facing since the tanks almost always face them north, but I do get hit once or twice when tanks need to dodge mechanics, face the boss another way, and 24 skills flash simultaneously.