Add sources in bulk

[Jangle-Klown]

It would be nice to be able to add multiple extension sources in bulk with a delimiter between the sources. e.g. source_link1;source_link2;source_link3

That way if you are setting up the app and have multiple sources, you can set it up with one line of sources. This would also help set up the app for someone else who isn't near you by allowing you to send one string of links to add instead of walking them through each one.