mod_http_oauth2: Organize HTTP routes with comments Starting to get hard to follow. Usually one would start tracing the steps at the HTTP authorize route. Vaguely sorted alphabetically by path and point in the flow. (/register comes before /authorize tho)

This module writes out a traceback to `traceback.txt` in Prosodys data
directory (see `prosodyctl about`) when the signal `SIGUSR1` is
received. This is useful when debugging seemingly frozen instances in
case it is stuck in Lua code.