added async stone detection thread

field.py

@@ -106,8 +106,6 @@ class Field():
         assert column + tetromino.width() <= Field.WIDTH
         last_fit = -1
         for row in range(tetromino.height(), Field.HEIGHT):
-            if Field.HEIGHT <= (Field.HEIGHT/2):
-                continue
             if self._test_tetromino(tetromino, row, column):
                 last_fit = row
             else:
@@ -162,6 +160,8 @@ class Field():
         """
         for i, row in enumerate(self.state):
             if ''.join(row).strip():
+                if (Field.HEIGHT - i) <= 10:
+                    continue
                 return Field.HEIGHT - i
 
 if __name__ == '__main__':