Instapaper support

[mrleblanc101]

My Kobo used to be able to read/sync from Pocket. When pocket died, they replace it with the second largest read-it-later service called Instapaper.

It would be nice to have native Instapaper integration since a read-it-later service is probably the only thing missing before I make the switch from my Kobo.

[mrleblanc101]

I think I confused CrossInk and CrossPoint, I'll reopen in the proper repo