Added progress indicator to command line interface

[Bioruebe]

This is a change made to the command line version of lessmsi for integration into Universal Extractor. It adds a progress display, written to stdout for each file extracted.

Example:

Extracting '<file.msi>' to '<folder>'.
1/296   license.txt
2/296   readme.txt
...

I think it's nicer for the user to see how far the extraction progress went, so you might want to add the change to the official repository. But it's just a suggestion :)

[activescott]

@Bioruebe Thanks. I agree it sounds better for the user. The build is failing now though on AppVeyor (appears to be a compile error). Can you please look at that?

[Bioruebe]

Oh, I completely forgot about this problem after giving up the first time ;)

Finally, here is a fixed version. It turned out to be a problem related to the way the stdout is read inside the test cases. For msi installers with many files the progress indicator caused an internal buffer to fill up and block the whole process. More information