添加稀有度机制 添加背景音乐素材

src/include/Tetris.h

@@ -108,6 +108,7 @@ struct UpgradeOption
     int id;
     int currentLevel;
     int targetPieceType;
+    int rarity;
     bool cursed;
     const TCHAR* name;
     const TCHAR* category;
@@ -156,6 +157,13 @@ enum GameMode
     MODE_ROGUE = 1
 };
 
+enum UpgradeRarity
+{
+    UPGRADE_RARITY_COMMON = 0,
+    UPGRADE_RARITY_UNCOMMON = 1,
+    UPGRADE_RARITY_RARE = 2
+};
+
 extern int nType;
 extern int type;
 extern int state;