- Removed unnecessary 'id' variable from AActor.

- Removed unused 'backpack' variable from player_t.
- Removed duplicate code from b_move.cpp.
- General cleanup.

src/p_mobj.cpp

@@ -252,9 +252,13 @@ void AActor::Serialize (FArchive &arc)
 		<< MinMissileChance
 		<< SpawnFlags
 		<< Inventory
-		<< InventoryID
-		<< id
-		<< FloatBobPhase
+		<< InventoryID;
+	if (SaveVersion < 4513)
+	{
+		SDWORD id;
+		arc << id;
+	}
+	arc << FloatBobPhase
 		<< Translation
 		<< SeeSound
 		<< AttackSound
@@ -4358,9 +4362,6 @@ APlayerPawn *P_SpawnPlayer (FPlayerStart *mthing, int playernum, int flags)
 	mobj->pitch = mobj->roll = 0;
 	mobj->health = p->health;
 
-	//Added by MC: Identification (number in the players[MAXPLAYERS] array)
-    mobj->id = playernum;
-
 	// [RH] Set player sprite based on skin
 	if (!(mobj->flags4 & MF4_NOSKIN))
 	{