Add MSDN url for each test in html report

[kostyanf14]

No description provided.

[akihikodaki]

report_data now modifies tests, which does not look like a good idea.

• For example, consider that you are adding a new feature that outputs the URLs in the future. You would naturally pp playlist.test to inspect the test data, find the url property, and use it. Later, you will no longer need an HTML output so remove the call to report_data. When you do so, it accidentally breaks the irrelevant URL output you have added earlier.
• This computes URLs twice in print_tests and report_data, but you don't really have to when you are storing URLs.

A possible alternative way is to store URLs in AutoHCK::Playlist#list_tests. This way, you can always expect tests to include URLs.