A button to download sequentially from webui

Hi, I saw you had added to the webapi.  I decided to make headway on that.

I never did call your functions.  The only reason was by using dumb toggle I was able to avoid complexity on the front end.  I actually do believe your functions are the correct ones to call but this is sort of proof of concept and initial structure.

While it is not finished I do think I'm going to put this one down for a little while and let it marinade.  While I do that feel free to play around with it if you would like and or improve upon it. 

Thanks for making the first move on what is for me a killer feature.
,Jason