Address LT-15558: Warn user on startup if last Lift S/R died

* Have the application call a method in FLExBridge listener
  when a project is opened that warns user if a lift import failure
  file is found.
* Continue if a previous failed import succeeds as was intended

Change-Id: Ia6c64fb8769c42768e9c42bb6adfcf3f7fcdb974