Add support for onDettached onAttach UnityWidget #729
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Add support for onDettached onAttach UnityWidget to help setup and dispose Unity without loading a new scene
Description
I use the attached boolean in the FlutterUnityWidgetController to know if it is the the corresponding Widget is attached.
When a UnityWidget is build it handles calling onAttached and onDetached on the Widgets which changed attached state.
The last controller added in UnityPlayerUtils.controllers will be the one to be displayed (which correspond to the last one built).
I needed to change lib/src/io/mobile_unity_widget_controller.dart MobileUnityWidgetController._() constructor because the stream was not initialized before the event was sent so it was not caught.
Only Android is supported for now.
Type of Change