Resumable Downloads, Commenting, Config editor

Resumable downloads are done, with the three things I mentioned in the last post now finished. I've spent some time adding more comments to the code to make it more readable.

Right now, I'm working on the config file editor. I'm playing around with Core Data, which will allow me to implement it very quickly and without a single line of code if I'm willing to change the file format a bit. I'm still undecided about whether to keep the old config format or not.