Refactor DungeonEditor and related components for improved object management and UI enhancements
- Replaced vertical separators with standard separators in the EditorManager's menu bar for consistency. - Introduced a new room selection callback mechanism in DungeonRoomSelector to facilitate room selection events. - Enhanced DungeonEditor with drag-and-select functionality for object placement, improving user interaction. - Added an object browser in DungeonObjectSelector for better object management and preview capabilities. - Streamlined object rendering and selection processes, ensuring a more intuitive editing experience.
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