Do not write ConsoleStartingFile and ConsoleFinishedFile when format is MSBuild #749
Description
Currently, each file processing is logged by ConsoleStartingFile and ConsoleFinishedFile, which produces
========== Linting <path to file>.fs ==========
========== Finished: 0 warnings ==========
This pollutes the Visual Studio output and makes results less readable.
I suggest removing this output when the MSBuild format is specified.