Ethan Reesor authored Jan 28, 2022 and Dennis B committed Jan 28, 2022

Closes AC-979. Update API to use `internal/routing.Router`, so that everyone is using the same code for routing.

Because of how I did this, it totally broke the way the API was batching transactions. Since we don't have any actual evidence that we need to batch execute API calls, I deleted all of that code.