Fix #527

TODO

• Test with all data
• Handle node and primitive references
• Reference all schemas
• Add helpers for properties that take class and property references and provide a function for reading the data
• Add demo with hover states, displaying table info

Next

• Add d.ts files
• Add simpler ability to get structural metadata from the features
• Add highlighting based on StructuralMetada fields + feature ids?

Questions

• Is it the case that all textures are guaranteed to be uint8 type?
• Recommendations on handling BigInt?
• Are property tables usable without node property and / or mesh features?
• Are attribute accessors usable without non point objects?
• What are the usable cases when an internal node does and doesn't contain an extension reference?