Enhance CameraControl Javadoc & Add Robustness

[capdevon]

This PR refactors the CameraControl class to improve code clarity and maintainability. Key changes include:

• Enhanced and expanded Javadoc comments for the class and constructors, clearly explaining usage and synchronization directions.
• Refactored the control update logic by extracting synchronization operations into separate spatialToCamera() and cameraToSpatial() methods for better readability and separation of concerns.
• Updated enum declaration style and improved parameter names and descriptions.
• Replaced magic strings with explicit string literals for serialization field names.
• Updated copyright.

These improvements clarify how CameraControl works, make the codebase easier to understand, and provide better guidance for future contributors. No behavioral changes are introduced.

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Edit:
Serializing the Camera is unnecessary and incorrect because deserializing the CameraControl object causes the Camera to no longer match the one in the SimpleApplication.