Implement object selection rectangle functionality in DungeonEditor
- Added methods for object selection rectangle handling, including CheckForObjectSelection, DrawObjectSelectRect, and SelectObjectsInRect. - Enhanced DungeonEditor to support right-click drag selection for multiple objects, improving user interaction and object management. - Updated the UI in DungeonObjectSelector to optimize object previews and improve layout for better visibility. - Refactored various sections of DungeonEditor for code clarity and consistency, including adjustments to object rendering and selection processes.
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