player now walks again, still stick to wall if key is kept down, but gravity is no longer accumulated (because the walking velocity is now separated)

Former-commit-id: f9394abe6230a4e60f2f7a42e81f7e85264a60c5
Former-commit-id: 1cd5b78c5800aef082d5eeec13a0a0a50ccea35b

src/org/dyn4j/geometry/Vector2.kt

@@ -542,12 +542,18 @@ class Vector2 {
      */
     operator fun not() = negate()
 
+    /**
+     * Negates this [Vector2].
+     * @return [Vector2] this vector
+     */
+    operator fun unaryMinus() = negate()
+
     /**
      * Negates this [Vector2].
      * @return [Vector2] this vector
      */
     fun negate(): Vector2 {
-        return Vector2(x * -1.0, y * -1.0)
+        return Vector2(-x, -y)
     }
 
     /**