Fully implement IsPlayer->IsElite

I imagine long ago in another kingdom that used to actually work (probably during original MS days.) It'd be nice to reimplement it for FN admins and probably server admins if FN is disabled.

I know mobs also use IsElite to check if they're a boss, but player should be a separate entity so it shouldn't interfere with mobs. However, it might interfere with the scripts, but IDK for sure.