Improve the murderer selection method; some clients are never getting picked

[AKMDM]

I think that anytime a group of people are playing, there are several or more clients that never have an opportunity to become the murderer once, as if the function that controls the murderer selection completely skips them. Clients joining/leaving the game might be causing this.

It can be frustrating when one person never seems to be picked while everyone else becomes the murderer several times before them, which isn't fair, so the function should be overhauled to fix this common issue.