Godot 4.6 Releases to stable

The Godot 4.6 release focuses on polish, quality-of-life improvements, and performance optimization, enhancing the development workflow for game creators. Key updates include a new editor theme, Jolt Physics as the default engine, movable docks, an improved inverse kinematics framework, and Screen Space Reflection enhancements. Unique Node IDs, LibGodot for embedding the engine, and decoupled Select and Transform modes are also introduced. Smaller enhancements like rotatable scene tiles, visual feedback for MarginContainer nodes, and live previews in the Quick Open dialog improve the overall user experience. The release aims to make Godot a more robust and user-friendly engine, ready for complex game projects.