RFC: Proposed config taxonomy changes
Tickets #458 (closed) and #285 (closed) request a review of our config taxonomy.
Now that arti-example-config.toml is tested to correspond to the config interpretation code, it is convenient to review the taxonomy there.  I have done this.  It looks pretty good to me, to be honest.  I propose the following two changes:
- 
dns_portandsocks_portought to becomedns.portandsocks.port, so that in the future we can havesocks.listen_addressor something.
- 
download_*ought to becomedownload.*(#489 (closed))
Currently the CI will fail since I have only changed the example to demonstrate the proposal, not any code. We should discuss these proposed changes, and any others, and then when agreed they can be implemented.
CC @nickm @eta: Please review not only my proposed changes, but the proposed new file as a whole.