[2022] Add a switch to decide the disappearance of corpse

While the loss of the body would improve the balance of the game, it would greatly reduce the core fun and gameplay of the entire game, which has been bothering me for a year. For some people it doesn't matter, but for me, what I think is the game has changed, and every time I see a dead body change into an icon my heart aches. I think it's like smoke immunizes itself, and that's the core of the game, and a lot of people do. And the solution to this problem is very simple, is to add a switch, like the outline of the enemy light, people who want to open it will let the body disappear, people who do not want to open it will turn it off, let him become the previous appearance. The game 《hell let loose 》is a good example. In this game, the retention time of the body can be adjusted at will, which retains the authenticity and playability without affecting the balance.UBi should update it long time ago