Implement battle pass

src/main/java/emu/nebula/game/battlepass/BattlePassManager.java

@@ -0,0 +1,27 @@
+package emu.nebula.game.battlepass;
+
+import emu.nebula.Nebula;
+import emu.nebula.game.player.Player;
+import emu.nebula.game.player.PlayerManager;
+import lombok.Getter;
+
+@Getter
+public class BattlePassManager extends PlayerManager {
+    private BattlePass battlePass;
+
+    public BattlePassManager(Player player) {
+        super(player);
+    }
+    
+    // Database
+    
+    public void loadFromDatabase() {
+        this.battlePass = Nebula.getGameDatabase().getObjectByUid(BattlePass.class, getPlayer().getUid());
+        
+        if (this.battlePass == null) {
+            this.battlePass = new BattlePass(this);
+        } else {
+            this.battlePass.setManager(this);
+        }
+    }
+}