Implement #2 anonymous authentication. This also puts into place the majority of the authentication framework, and starts to build the IDM layers ontop of the DB engine.
This implements access controls, including a huge amount of refactor to support
them and their resolution with the "SelfUUID" keyword. Additionally, parts of
the event structure was improved to help, normalised was added as an entry state
and more.
And there are access controls! They work, have tests, and appear sane.
* Large refactor to improve the ava get interface
* Improve ACP parsing test
* ACP parsing complete
* Fix txn type tech debt
* Clean up queryserver name issue
* Integrate acp to query server, and add reload hooks
* Starting to write search acp enforcement
* Refactor event to take entry rather than UUID to allow acp to filter on the event properly.
* Most of the filter refactor is done
* Finish filter refactor!
* Write and implement basic filter optimiser with redundant term folding
