Design new version of .simularium data formats

[blairlyons]

Use Case

As a developer, I want to be able to represent more types of data in simularium format.

Acceptance Criteria

new file_format.md describing the updated format.

Details

Current file format

New data to represent:

• arbitrary string of data (which could include links) for each agent at each time

• include n_agents in the frame header for each time

• time-series volume data

• data for edges connecting agents

• spatial values saved in subpoints should be relative to the agent's transform.

• optionally save ambient occulusion and other rendering settings

• support levels of detail

• [ ] Research Pixar Universal Scene Descriptor (USD) format

• [ ] Research other visualization formats that represent similar data

[toloudis]

• represent integer data with true binary integers vs floats
• consider a chunked file format where each frame could be its own file

[blairlyons]

include a vector of data for each agent, maybe in subpoints?