Time for action – update Game1 to draw animated pieces

1. Add methods to the Game1 class to draw each potential type of game piece (animated and non-animated):

   private void DrawEmptyPiece(int pixelX, int pixelY)
   {
       spriteBatch.Draw(
           playingPieces,
           new Rectangle(pixelX, pixelY,
               GamePiece.PieceWidth, GamePiece.PieceHeight),
           EmptyPiece,
           Color.White);
   }
   
   private void DrawStandardPiece(int x, int y, 
       int pixelX, int pixelY)
   {
       spriteBatch.Draw(
           playingPieces, new Rectangle(pixelX, pixelY,
               GamePiece.PieceWidth, GamePiece.PieceHeight),
           gameBoard.GetSourceRect(x, y),
           Color.White);
   }
   
   private void DrawFallingPiece(int pixelX, int pixelY, 
       string positionName)
   {
       spriteBatch.Draw(
          playingPieces,
          new Rectangle(pixelX, pixelY -
           gameBoard.fallingPieces[positionName].VerticalOffset,
            GamePiece.PieceWidth, GamePiece.PieceHeight),
            gameBoard.fallingPieces[positionName].GetSourceRect...