More Win Screen API (#8805)

Adds methods to get and set whether a player has seen the win screen before.

patches/server/Win-Screen-API.patch

@@ -3,6 +3,8 @@ From: Lama06 <andreasprues36@gmail.com>
 Date: Sat, 21 Jan 2023 13:53:23 +0100
 Subject: [PATCH] Win Screen API
 
+== AT ==
+public net.minecraft.server.level.ServerPlayer seenCredits
 
 diff --git a/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java b/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java
 index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
@@ -19,6 +21,16 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +        var packet = new ClientboundGameEventPacket(ClientboundGameEventPacket.WIN_GAME, 1);
 +        getHandle().connection.send(packet);
 +    }
++
++    @Override
++    public boolean hasSeenWinScreen() {
++        return getHandle().seenCredits;
++    }
++
++    @Override
++    public void setHasSeenWinScreen(boolean hasSeenWinScreen) {
++        getHandle().seenCredits = hasSeenWinScreen;
++    }
 +    // Paper end
 +
      @Override