Universal cross-world access option

[sophialuden]

When enabling cross-world property access, accessing worlds must be authorized individually. It would be nice to have an option analogous to chmod o+r foo, allowing access (of certain kinds, to certain properties) to any world. This would allow worlds to provide public-facing APIs.

Possibly safeguards should be put in place against public dict/code/text/gentext write permission.

[erkyrath]

Reasonable idea.