* Extract some of startApp into a reusable method
* Get basic attach --machine working
* Attach --machine tweaks
Move validation to validate method and create daemon early so we get the startup event before trying to get a connection.
* Bump daemon version so we know whether it's valid to flutter attach
* Tweak output text
* Swap package imports for relative
* Review tweaks (naming, formatting, typedefs)
* Separate arguments from process spawning
This will make calling attach easier
* Add a basic test for flutter attach --machine
* Fix crash if port unforward modifies the list of forwarded ports
* Add a no-op port forwarder for flutter-tester
* Switch to using BasicProject instead of our own inline code
* Fix expectation in test now we have a portForwarder
* Remove stale TODO (this is done)
* Tweak formatting
* Change some Completers to void to fix Dart 2 issues
