Clean: Fixing depr warnings in Editor/Rust - Added a bit of error checking to SceneToPrefabs to avoid accidents - EditorApplication -> EditorSceneManager for all scene related work - ListView event changes, onItemsChosen -> itemsChosen, onSelectionChange -> selectionChanged 27 warnings to go. Tests: ran Scene2Prefab/Locate Renderers with no LOD Components - it detected a number of issues, so green. Other changes are trivial.