[arch-projects] json-rpc for aur (experimental)

[eliott]

> Be sure to update the support/schema/aur-schema.sql file. It's generally
> best to include those changes in the commit that requires them, so that
> when I go to deploy, I can diff the changes to the schema and make sure
> any necessary changes have been made before deploying.

Sure thing Paul.

I amended the commit on my testing branch, so that it includes the
schema update in it too now. Will be easier to cherry the entire rpc
stuff this way.

As a side effect, you may need to do the -f force fetch to overwrite
your local pull of my testing repo.