* Add discussion of state pointers and the tokens SDK.
Fix ugly hyperlink boxes.
Comment out "market infrastructure" section for now as it was never implemented. It will come back in a later PR that creates a "future work" section.
* Address review comments.
Tech white paper refresh, part 1.
In part 1:
* A new section is added on package namespace ownership and the no-overlap rule.
* The spelling of "serialize" is standardized on the US spelling used by the code, and add some content on serialization to the docs.
* Make a variety of smaller edits intended to make it read better.
* Spelling fixes.
* The discussion of C-I is temporarily removed, pending later re-addition in a new privacy section.
* Reference states are described.
* More TODOs are added to help me keep track of things that are needed.
* The discussion of time and clock sync is updated.
* The discussion of identity lookups is removed.
