增加难度上升机制

src/include/Tetris.h

@@ -97,6 +97,9 @@ struct PlayerStats
     int stableStructureLevel;
     int doubleGrowthLevel;
     int gamblerLevel;
+    int difficultyElapsedMs;
+    int difficultyLevel;
+    int lockedRows;
     int pieceTuningLevels[7];
 };
 
@@ -204,5 +207,8 @@ void UseScreenBomb();
 void UseBlackHole();
 void UseAirReshape();
 int GetRogueFallInterval();
+int GetRoguePlayableHeight();
+int GetRogueLockedRows();
+void AdvanceRogueDifficulty(int elapsedMs);
 
 void TDrawScreen(HDC hdc, HWND hWnd);