[TIMOB-17990] Print the CLI build command in the console view

resolves https://jira.appcelerator.org/browse/TIMOB-17990
For your earlier comment, when run directly from the CLI, the banner is output just once. I don't understand why you're seeing it output three times when run within Studio.

It's hooked into the project-dir stage so that we're sure we have valid project directory and platform values. This was the stage identified by cbarber as the most appropriate for starting the file logger. I'll try outputting the banner at another stage; maybe that will resolve the triplication you're seeing.