This patch:
- Introduces a core update() event that should be invoked whenever flows are
changed outside of the normal lifecycle.
- Extend view.resolve to know about @all, which matches all flows in the view.
- Add a core flow.resume comand, which resumes flows and broadcasts an update event.
- Define flow list bindings for:
A -> flow.resume @all
a -> flow.resume @focus
d -> view.remove @focus
z -> view.remove @all
- 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.
