Implement multi-resolution playback

[ngchisern]

This PR introduces support for multi-resolution playback:

• Users can now supply either 1 or 3 arguments as their files/folders.

Implementation Details:

• A new render reader, AdaptiveReader, has been introduced.
• Depending on the camera state, the AdaptiveReader selects the appropriate reader for data retrieval.

Future Work:

1. Currently, the reader selection is solely based on the model's distance from the camera. A better heuristic, such as point distance rendered on the screen, can be utilized.
2. Allow users to input an arbitrary number of files (>= 1).
3. Re-evaluate the camera state updating mechanism, as cloning operations can be costly.