Allow piece to take swing action when deciding which path to take, Add test...

Allow piece to take swing action when deciding which path to take, Add test case 0 to test swing action.XUAN TRINH 4:00PM 27 mar 2021

Test_case/level_1/0.json

+{
+  "upper": [
+    [
+      "r",
+      4,
+      -4
+    ]
+  ],
+  "lower": [
+    [
+      "s",
+      -4,
+      4
+    ],
+    [
+      "r",
+      -1,
+      1
+    ],
+    [
+      "r",
+      1,
+      -1
+    ],
+    [
+      "r",
+      3,
+      -3
+    ]
+  ],
+  "block": []
+}
\ No newline at end of file