Many addons currently save options on configure(), either as individual options
or sometimes by saving the entire options object. The current options should
simply be available on the ctx object, simplifying state management for addons
considerably.
- Add an options parameter to the start() event. This is to be used by addons
on startup to add custom options.
- Add a running() event that is called once the proxy is up and running.
- With the new paradigm we can't log during master __init__, so add a tiny
termstatus addon to print proxy status to terminal once we're running.
