Demos: ensure all use fun main() = application {

- Adjust some demo window sizes.
- Replace Random.double by Double.uniform
- Tweak some demos so screenshots look more interesting

orx-jvm/orx-dnk3/src/main/kotlin/features/VoxelConeTracing.kt

@@ -62,7 +62,7 @@ private fun SceneRenderer.processVoxelConeTracing(drawer: Drawer, scene: Scene,
                 val position = Vector3.ZERO
                 drawer.lookAt(position + side.forward*40.0, position , side.up)
                 drawPass(drawer, pass, materialContext, context) {
-                    it.parameter("voxelMap", feature.voxelMap!!.imageBinding(0, ImageAccess.WRITE))
+                    it.image("voxelMap", feature.voxelMap!!.imageBinding(0, ImageAccess.WRITE))
                 }
             }
         }