Allow auto-get and sync comments from multiple remote sources

[surajrao]

As discussed in SOCVR chat here I would like to request an enhancement/feature where a user can sync comments from multiple source URLs like SO.Main comment repo in SOCVR and SE comment repo in Charcoal url:https://charcoal-se.org/userscripts/charcoal-autocomments/comments.js or any other private url.