Add ability to manipulate player roles

src/gamemodes/amongus/gamemode/sv_game.moon

@@ -170,11 +170,27 @@ GM.Game_Start = =>
 			--	memo[a] = 1
 			-- if not b.entity\IsBot!
 			-- 	memo[b] = 1
-
-			memo[a] = memo[a] or math.random!
-			memo[b] = memo[b] or math.random!
+			if not memo[a]
+				if @PlayersMarkedForImposter[a.entity]
+					memo[a] = math.random! + 1
+				elseif @PlayersMarkedForCrew[a.entity]
+					memo[a] = math.random! - 1
+				else
+					memo[a] = math.random!
+
+			if not memo[b]
+				if @PlayersMarkedForImposter[b.entity]
+					memo[b] = math.random! + 1
+				elseif @PlayersMarkedForCrew[b.entity]
+					memo[b] = math.random! - 1
+				else
+					memo[b] = math.random!
+
 			memo[a] > memo[b]
 
+		@PlayersMarkedForCrew = {}
+		@PlayersMarkedForImposter = {}
+
 		imposterCount = math.min GAMEMODE.ConVarSnapshots.ImposterCount\GetInt!, @GetImposterCount #initializedPlayers
 		for index, ply in ipairs @GameData.PlayerTables
 			-- Make the first N players imposters.

src/gamemodes/amongus/gamemode/sv_player.moon

@@ -384,6 +384,28 @@ GM.GetFullyInitializedPlayers = => return for ply in *player.GetAll!
 	else
 		continue
 
+GM.PlayersMarkedForCrew or= {}
+GM.PlayersMarkedForImposter or= {}
+--- Marks a player to become crewmate next round.
+-- This function doesn't overwrite the imposter count and therefor will be ignored if too many players are marked.
+-- @param ply Player entity.
+GM.Player_MarkCrew = (ply) =>
+	@PlayersMarkedForCrew[ply] = true
+	@PlayersMarkedForImposter[ply] = false
+
+--- Marks a player to become crewmate next round.
+-- This function doesn't overwrite the imposter count and therefor will be ignored if too many players are marked.
+-- @param ply Player entity.
+GM.Player_MarkImposter = (ply) =>
+	@PlayersMarkedForCrew[ply] = false
+	@PlayersMarkedForImposter[ply] = true
+
+--- Unmarks a player
+-- @param ply Player entity.
+GM.Player_UnMark = (ply) =>
+	@PlayersMarkedForCrew[ply] = false
+	@PlayersMarkedForImposter[ply] = false
+
 hook.Add "PlayerInitialSpawn", "NMW AU AutoPilot", (ply) -> with GAMEMODE
 	oldAutoPilot = \IsOnAutoPilot!