Multi-platform rewrite

A candidate for rewrite is https://pub.dev/packages/ar_flutter_plugin after SceneView refactor (https://github.com/giandifra/arcore_flutter_plugin/issues/202) or the `new_sceneform` branch is completed. Also see https://github.com/SceneView/sceneview-flutter/issues/2

(Along the line of https://github.com/RecyclingTrashCans/recycling-trashcan-armap/issues/18)