New cvar to limit specs show on ready-up

If there are more spectators than the cvar value, the spectator's names
wont be shown and instead "Many (%d)" will be shown
Change client to survivor method changed

This method should be more safe and prevent creating dead survivors if
someone just left the survivor team
Add cvar to hide players spectating
FL_INWATER check and hanging fix

Individual survivors will be warped back when touching water (hopefully
there are no saferooms with water)
Hanging survivors will no longer be hanging when warped back which fixes
a few spots that survivors couldn't be saved from