ActorWithBody: broke CCD again for fundamental error-catching, new tile STONE_BRICKS

Former-commit-id: 3d98f83f3d40f4423b403eae717a06ac6fc22531
Former-commit-id: 13616655a392941e0c91c3384384475ae0adb5db

src/net/torvald/point/Point2d.kt

@@ -5,6 +5,10 @@ package net.torvald.point
  */
 class Point2d(var x: Double, var y: Double) : Cloneable {
 
+    override fun toString(): String {
+        return "($x, $y)"
+    }
+
     fun set(x: Double, y: Double) {
         this.x = x
         this.y = y