Support keeping some scene properties while hot reloading

[soywiz-invideo]

class MyScene : Scene() {
    @KeepOnReload var textSize = 100.0 // If this value is modified at runtime, the new value will be persisted if we hotreload the scene. Effectively making modifying this value when compiling a no-op until the app is closed and reopened. You can also remove the annotation to modify again the value by code.

    @KeepOnReload var positionX by Delegates.observable(50.0) { _, _, _ -> reload() } // It even works with delegates! So we can register it later.

   // Also when a scene is reloaded the SContainer view will be highlighted, so the debug components will appear
   fun SContainer.sceneMain() {
      // Now we can add a debug component and use the views debugger to manually adjust properties that will be persisted later
      extraBuildDebugComponent = { views, view, container ->
        container.uiCollapsibleSection("Debug") {
            uiEditableValue(::textSize)
            uiEditableValue(::positionX, min = 0.0, max = 100.0, clamp = true)
        }
     }
   }
}