wiresim: signal sinking actors are only getting updated when the sim calls for

src/net/torvald/terrarum/Point2d.kt

@@ -1,5 +1,6 @@
 package net.torvald.terrarum
 
+import net.torvald.random.XXHash32
 import org.dyn4j.geometry.Vector2
 
 /**
@@ -115,6 +116,10 @@ class Point2i() {
         return this
     }
 
+    override fun hashCode(): Int = XXHash32.hashGeoCoord(x, y)
+
+    override fun toString() = "Point2i($x, $y)"
+
     operator fun component1() = x
     operator fun component2() = y
 }