feat(Util): Make Ground vector accept y axis

Author: jcs090218

Assets/JCSUnity/Scripts/Util/JCS_Vector.cs

@@ -320,13 +320,13 @@ public static Vector3 GetFinalLocalEulerAngles(Transform trans, ref Vector3 inEu
         /// <summary>
         /// Make the vector to a ground vector.
         /// </summary>
-        public static Vector3 GroundVector(Vector3 vec)
+        public static Vector3 GroundVector(Vector3 vec, float y = 0.0f)
         {
-            return new Vector3(vec.x, 0.0f, vec.z);
+            return new Vector3(vec.x, y, vec.z);
         }
-        public static Vector2 GroundVector(Vector2 vec)
+        public static Vector2 GroundVector(Vector2 vec, float y = 0.0f)
         {
-            return new Vector3(vec.x, 0.0f);
+            return new Vector3(vec.x, y);
         }
 
         /// <summary>