* allow per-command analytics suppression

* rev the usage package dep

* make the usage text more visible

* update the look of the usage text

* fix analysis errors

* review comments; fix test

* re-add an export for debugPrint

* add google analytics

* send in the run target type

* track device type targets

* use the real GA code

* review comments

* rev to usage 2.0

* rev to 2.2.0 of usage; add tests

* review comments

flutter start's method of finding devices to run the app on is not suitable for flutter drive.

This commit also refactors several tool services to allow mocking in unit tests.