WorldInfo extension

[willneedit]

The WorldInfo needs improvement.

1. WorldCid will be renamed to TemplateCid, with the same meaning.
2. WorldContentCid will be added, pointing to a list of 3D objects, with their transorm data and additional properties (details TBD)

WorldInfo with WorldContentCid == null means as-is - Template with their names, description, content rating and author name. TemplateCid will atill point to the original template author.

WorldInfo with WorldContentCid != null means a fully decorated - e.g. a furnished cookie-cutter suburbia house. Name, description and permissions can be altered accordingly.

[willneedit]

Better:

1. WorldCid stays as-is, pointing to its AssetBundle and Metadata, in its directory,
2. New name: WorldContent, pointing to a file named "WorldContent.jsom" (or, protobuf?)
3. ListFile(WorldCid) yields...

• ...missing: Naked template
• ...existing: Decorated world

4. Maybe with another metadata file, or embedded in the WorldContent file.

• IPFS's directory is organized with MerkleDAG - Copying templates as-is means deduplication. Adding or removing files would be easy, only the root DAG node would be modified, resulting to a changed WorldCid.

• Removing the WorldContent file would revert the root DAG node, making it possible to expract the original template's WorldCid.

[willneedit]

Already done. Changes to WorldInfo are unneccessary.