Improve Paladin Mark UI and Fix Bugs

1. The paladin mark UI does not distinguish players with similar names. The FA font has a few letters that look the same (this is common in fonts). For instance, a lowercase "L" (i.e. l) looks the same as a capital "i" (i.e. I). This makes it possible to create player names that are rendered exactly the same in the paladin mark UI. One possible solution would be to add players colors and faction icons to the paladin mark UI.
2. Dead players can be marked. There's no point in marking a dead player, so once a player dies, they should be removed from the available choices.
3. When playing with remaining players counts (i.e. "Reveal Players After Death" is on), the paladin mark button should disappear once the last paladin is dead.