Update the "ResourcesOrganizer" tool to work with HTML files

[nickshulman]

I have started the work of making the "ResourcesOrganizer" read localized strings from HTML files.

I copied just the "Data Independent Acquisition" tutorial from PR #3097.
I changed the folder layout a little so that there are three sibling folders for the languages: "en", "ja", and "zh-CHS".
Also, the name of the HTML file in each folder is "index.html".

In the localized folders, there is also a new HTML file called "invariant.html" which is the HTML file that the localized index.html was translated from.

In theory, the ResourcesOrganizer tool will be able to compare "ja/invariant.html" with "en/index.html" and figure out which paragraphs need to be sent to the localizers for re-translation.

[brendanx67]

Note that I have a strong desire to a have the HTML file(s) sort tot the top of the file list by default in these folders. Sadly, index.html still comes after image-##.* We can always name the images z-image-##.* Just keep this in mind as we design these folders.

Also, I want the folder names to match the shorter names we are using on the website which we combine with a version number for the PDF files, and also we use them for the covershot images. Probably we should add this name as an attribute to the test function and add a mode in SkylineTester that allows you to view the tutorials by these names to make the link between tests and tutorial documents clearer.

[nickshulman]

I'll create a different pull request for this.