Bug 1054326: Initial attempt to submit Imagecompare test framework and test cases int...

...o the main branch
oh, the reason is that I need to assign a id number for each of the pictures taken, and I do this by ordering the screenshot images by its timestamp and appending the number to its new filename based on its order.  If I copy it directly to either the ref image path or shots path, then it gets mixed up with the preexisting image files in the folder.  I thought about a few other approaches, but thought this is the most simple and straightforward way.