Add more image metadata to otio file.

We base a lot of the generated output file info on the results of "get_output_filename", we should embed this result into the OTIO file, so that when we generated the HTML file, that result can be determined from the file, and not guessed at.

So the change would be putting the get_outputfilename into the results metadata.

In the results template and outputTemplate, we should be creating a field which is using that basename replacing {{ test.default_media.basename }}-{{ enc_info.name|e }} with that value.

Start by locating get_output_filename and the results template and outputTemplate mentioned in the issue, then trace how their metadata is written into the OTIO file. Verify that the generated HTML can obtain the output basename from the OTIO metadata rather than guessing it.

Written by the indexing model from the issue text.